Sans

1. #1Snowdin Forest

   Keys: Snowdin Forest, Snowdin

   Coniferous trees, snowfields, and small cave systems populate Snowdin Forest, and this region has many characteristics of a taiga biome. It also includes a large river that flows east; Ice Wolf uses this river to transport ice to the CORE. Snow blankets the ground throughout Snowdin Forest and Snowdin Town. The first room of Snowdin Forest is long and horizontal, and coniferous trees provide a constant background. As the protagonist walks to the right, coniferous trees freckle the foreground, allowing Sans to appear as a silhouette between them as he follows the protagonist. After his introduction, Sans informs the protagonist that his brother constructed the wooden bridge. After crossing the bridge, the protagonist hides behind a conveniently-shaped lamp, which is located next to Sans's sentry station and a couple rocks. This area serves as Papyrus's first appearance as the brothers talk to one another. The right end of the first room connects to the "Box Road", which has a SAVE Point and a box that contains the Tough Glove. The north exit of this room connects to the river with a fishing rod holding a note underwater. The right exit leads to the next encounter with Sans and the protagonist's first encounter with Papyrus. The horizontal room that features the encounter with Sans and Papyrus also houses Papyrus's cardboard sentry station near the east exit. This exit leads to a short horizontal room that contains Doggo's sentry station and the first canine mini-boss battle, in which Doggo introduces blue attacks. There are dog treats to the right of Doggo's station. After going through the east exit, the protagonist encounters Sans and a patch of ice that they can slide on. A sign in the middle of the ice reads that ice is in all directions and that Snowdin Town is to the east. To the north of the ice room, a snowman offers the protagonist a piece of himself to take with them on their travels. The east exit of the ice room leads to the Invisible Electricity Maze, hosted by Sans and Papyrus. This small room connects to a larger room that has the Nice Cream Guy, who sells Nice Cream, the snowdecahedron, as well as the Ball Game. The exit in the top right of this room leads to the sentry stations of the Dogi, and also includes a sign that explains "smell danger ratings." The bottom right exit of the large room leads to another encounter with Sans and Papyrus. A word search lies on the ground, provided by Sans. The east exit of this small room leads to the "Spaghetti" room, which contains a note from Papyrus, frozen spaghetti that is stuck to the table it is on, and a microwave. The microwave and spaghetti are on separate tables. A wall to the north has a mouse hole and, atop this ledge, there appears to be frozen flowers. On the True Pacifist Route, the dialog of the table changes. The east exit of the "Spaghetti" room leads to a large room whose exit is blocked by spikes. At the bottom left of the room, there is a map covered in snow that the protagonist can reveal by walking over it. The switch to retract the spikes is located between two coniferous trees in the upper right of the room. After passing the retracted spikes, the protagonist encounters the Dogi. Once the Dogi are defeated, the protagonist can leave the large room through the south exit and complete the first XOXO puzzle. Once completed, spikes near the east exit of the room retract, and Papyrus questions the protagonist about the state of his spaghetti trap. After leaving through the east exit, the protagonist encounters the second XOXO puzzle that Papyrus supervises because he modified the puzzle while he was waiting. Again, spikes prevent the protagonist from leaving the room through the east exit until they complete the puzzle. The next room hosts the Multicolor Tile Puzzle, which has a console that looks strikingly similar to Mettaton. Both Sans and Papyrus look on as the machine creates a simple "puzzle" for the protagonist to solve; Papyrus spins out of the room without saying a word. If the protagonist asks Papyrus to repeat the rules for the Multicolor Tile Puzzle multiple times, he becomes confused and tells the protagonist to try the puzzle on their own. Papyrus leaves illegible instructions and walks offscreen. Leaving the Tile Puzzle room through the east exit leads to the "Dog House" room, which contains Lesser Dog's station and, depending on the protagonist's actions during Lesser Dog's encounter, various degrees of snow sculptures. If the protagonist killed Lesser Dog, the statues are replaced with a pile of mushy snow. The east exit of this room leads to the third and final XOXO puzzle, which the protagonist has to slide on ice to solve. Falling off of the edge of this puzzle causes the protagonist to leave this room and appear in a room directly south of the XOXO puzzle. This room contains a snow Papyrus and a lump of snow with Sans's name written on it. The north exit of this room leads back to the XOXO puzzle. A bridge that leads to the east exit of the room forms after the protagonist completes the puzzle, and they can slide through a tunnel of coniferous trees to get to the next area. Directly south of the bridge is an area where the protagonist encounters Gyftrot and where the Mysterious Door is located. Within the small room that contains the Mysterious Door, two lantern mushrooms can be turned on and off with no consequence. Within this small room, the protagonist can encounter a hidden enemy, Glyde. Backtracking to the ice bridge's exit, if the protagonist travels east, they encounter a room full of snow poffs. This room also contains the small doghouse of Greater Dog. Near the east exit, Greater Dog's encounter with the protagonist occurs after they rise out of the snow disguised as a snow poff. After defeating Greater Dog, the protagonist can leave the room through the east exit and approach the last puzzle, the Gauntlet of Deadly Terror.

2. #2Snowdin Town

   Keys: Snowdin, Snowdin Town

   Snowdin is a town the protagonist encounters after they leave the Ruins and travel through Snowdin Forest. Departure from the town takes the protagonist to Waterfall by foot or, by hitching a ride with the River Person, to either Waterfall or Hotland. Despite being Underground, Snowdin is covered in a perpetual layer of ice and snow, and, because of how cold it is, it mainly homes monsters with thick fur or monsters that do not get cold. The Snowdin Shop is the first building the protagonist encounters after entering Snowdin Town, with a SAVE Point and a Dimensional Box next to it. It has a smaller building that connects it to the Snowed Inn. It is the first vendor the protagonist encounters in the game. A female purple bunny runs the shop, and the protagonist can ask her what there is to do in Snowdin and about the history of the town. She is positive about the Underground's future.[2] The rabbit who runs the Snowed Inn is her sister. The Snowed Inn is a building in which the protagonist can sleep, and recover their health to between 30 and 38 HP (depending on their current HP) or their max HP (at LV 6 or higher). Even though the room price is 80G, the protagonist is refunded because they only stay for "two minutes." If the protagonist does not have 80G when they initially try to rent a room, the innkeeper allows them to stay for free on all subsequent visits. Alternatively, the innkeeper charges full price for all visits if the protagonist paid 80G for their first stay. After the protagonist rents a room, they head upstairs and lie in bed for a few moments. Three white monsters snore a song in the adjacent room. The Snowdin Library, misspelled as "LIBRARBY" on the sign, is a building near the middle of Snowdin. Around a table, two newspaper editors and a Loox are present. One editor discusses how they make content even though there is never much to report on while the other talks about their history with word searches. The Loox looks at the protagonist and sees which game troubles them the most. Depending on what was chosen during the Monster Kidz Word Search Puzzle, the Loox responds accordingly. A lizard is also present, commenting on their awareness of the library sign's misspelling. Some monsters hang out at Grillby's, including Lesser Dog, playing poker against itself, Dogamy and Dogaressa, Doggo, Greater Dog, Grillby, and a few others. Sans also frequently hangs out at Grillby's and even performs stand-up comedy at times. If Papyrus is spared, the protagonist can enter his home and go on a date or hang out, depending on if they flirted with him during his battle. The bottom floor of the house consists of a living room and a kitchen, and the second floor features Papyrus's room on the left and Sans's room on the right. Sans's room cannot be entered normally. If the protagonist gained no EXP when Sans judges them in the Last Corridor, restarting the game multiple times grants them access to his room and in turn grants them access to his workshop in the back of the house, in which there are old pictures of him with his friends. The north exit of the main part of Snowdin Town leads to a long horizontal room. On the right side of the room, the Ice Wolf throws ice into the east-flowing river; this ice eventually travels to the CORE. On the left side of this room, a few NPCs are playing "Monsters and Humans" in front of their house while their father looks on. If the protagonist leaves this room through the north exit, they arrive in a small room that connects to the water. After the protagonist reaches Hotland, this is the place where the River Person picks up and drops them off in Snowdin Town. This area is also where the Wrong Number Song plays if the "fun" value is within the range 2 to 39.

3. #3Snowdin Shopkeeper

   Keys: Snowdin Shopkeeper, Shop

   The Snowdin Shopkeeper appears to be a slightly plump purple bunny. She wears a tank top, small necklace, and summer hat. The shop itself is a brightly lit, orange store, with shelves of materials and wares. The Snowdin Shopkeeper is friendly, allowing the protagonist to buy from her, but does not allow them to sell items to her. She is knowledgeable about the monsters' history in the Underground as well as the buildings that can be found in Snowdin, though when talking to her in the True Pacifist Route epilogue, it is shown that she did not realize the protagonist was a human. She also cares about her family as she leaves a note in her shop that says "Please don't hurt my family." during the Genocide Route.

4. #4Grillby's

   Keys: Grillby's

   Grillby's is a pub located in Snowdin. It is named after and run by Grillby, a monster made entirely of fire. Grillby's is one of the many buildings in Snowdin, located to the left of the Snowdin Library and Papyrus and Sans's House. Grillby's contains a couple of booths, tables, a bar and a broken jukebox. As mentioned above, it contains a variety of NPCs, from Big Mouth to Punk Hamster, including the Snowdin Canine Unit, if the protagonist spares them before reaching Snowdin.

5. #5Papyrus and Sans's House

   Keys: Sans's House, Papyrus's House, Sans and Papyrus's House

   Papyrus and Sans's House is a location in Snowdin. Christmas decorations adorn the house, and it is unlocked after the protagonist befriends Papyrus. To the left of the house is Sans's mailbox, which is full of junk mail, and Papyrus's empty mailbox. The first floor of this house contains a living room and a kitchen. The living room features a television that is always set to one of Mettaton's shows when turned on. The living room also hosts Sans's pet rock, which is covered in sprinkles, and one of Sans's dirty socks with a series of sticky notes attached to it. These sticky notes depict Papyrus nagging Sans to pick it up. The living room also contains an old couch that gives the protagonist 20 GOLD when they first check it, and a joke book that contains a quantum physics book which contains another joke book containing another quantum physics book. The protagonist decides to stop at this point. The kitchen contains a stove with an empty pie tin in it, a trash can, a tall sink, and a fridge that has containers labeled "spaghetti" on one side and an empty bag of chips on the other. The second floor of the house contains a framed painting of a cartoon bone and doors leading to Papyrus's room and Sans's room. The door to Papyrus's room is plastered with labels reading (NO GIRLS ALLOWED!), (NO BOYS ALLOWED!) and (PAPYRUS ALLOWED.) The door to Sans's room has multicolored flames under the door which do not hurt the protagonist if stepped on. Papyrus's Room is where the protagonist befriends Papyrus. His room contains a racecar bed, action figures, pirate flag, a bookshelf with complex tomes about puzzle creation and children's books, a computer opened up to a social media website, a box of bones, and a closet with clothes neatly hung up inside. Sans's Room is unlocked in a no EXP earned Neutral Route by listening to Sans in the Last Corridor explain EXP and LOVE and then reloading the SAVE file. This can also be accomplished by having already completed the Neutral Route once and then returning to the area in a second Neutral Route. After either method, Sans notices the protagonist has already heard his spiel and exchanges one codeword, and then another, which is revealed by reloading again. Sans then gives the protagonist the key to his room, which mysteriously appears on the protagonist's keychain. When the protagonist first enters the room, they walk into what is seemingly an empty void. After a bit of walking, Papyrus turns on the lights to the room and tells the protagonist that they were using a treadmill in the dark. Sans's room is messy, containing a self-sustaining tornado of trash, an unused treadmill with a note that reads "the truth is that you got owned, nerd....." It also contains a dirty sock pile, a worn mattress with sheets bundled up in a weird creasy ball, an uncovered pillow, a "thank you" letter addressed to Santa, a lamp with a flashlight that is out of batteries stuck in the bulb socket, and a drawer with a Silver Key, clothes, and trombones inside of it. Papyrus's Toolshed, also known as the capture zone, the doghouse, the guest room, the Coolshed, or Papyrus and Sans's garage, is a small shed located to the right of Papyrus and Sans's House. It is where the protagonist gets trapped in when they manage to lose and get captured by Papyrus. The contents in the shed slightly change every time the protagonist loses to Papyrus. The shed starts out with a bowl of dry food, a squeaky chew toy, and a bed that is too small to sleep on. There is a note that reads "SORRY, I HAVE TO LOCK YOU IN THE GUEST ROOM UNTIL UNDYNE ARRIVES. FEEL FREE TO MAKE YOURSELF AT HOME!!! REFRESHMENTS AND ACCOMMODATIONS HAVE BEEN PROVIDED. -NYEHFULLY YOURS, PAPYRUS." The bars of the shed are built too far apart, just like the ones on the bridge in Snowdin Forest, so the protagonist can easily escape from it. The second time the protagonist loses, there is a hot dog cut up into the bowl of kibble, and the note has been changed, now reading: "PLEASE ASK BEFORE YOU ESCAPE!!! WHEN YOU WENT MISSING I GOT WORRIED SICK!!! -SLIGHTLY BONETROUSLED, PAPYRUS." The third time the protagonist loses, Papyrus's note just says: "IF YOU'RE JUST LOOKING FOR A PLACE TO STAY... JUST ASK!!! YOU DON'T NEED TO FIGHT ME!!! -YOUR HOST, PAPYRUS." The word "Bonetrousled" in the second note is likely a reference to the track that plays while fighting Papyrus, Bonetrousle. After three losses to Papyrus, the next time the protagonist meets him, he gives them the option of skipping the fight, saying that he is getting exhausted from capturing the protagonist. Accepting his offer leads to the same post-fight dialogue as if the protagonist had fought and spared him normally. If the protagonist attempts to access the shed after befriending Undyne, Papyrus informs the protagonist that it is his "COOL TOOLSHED.". Undyne then exclaims "Do you call it your coolshed!?" Papyrus admits that he has never thought of that, and adds "THAT'S WHY WE'RE FRIENDS, UNDYNE. YOU ENRICH MY LIFE WITH SHED-BASED PUNS." Undyne comments that this is the only shed-based pun that she has ever made. Sans's Workshop is located in the house's basement. It can be found behind the house and can only be opened with the Silver Key found in Sans's room. At the bottom right corner of the room, there is a strange, covered-up machine that seems to be broken. The workshop has four drawers, but the protagonist cannot interact with the rightmost two; in an attempt to do so, they interact with the blueprints on the shelf just above the drawers. The blueprints are described as being of a machine and written in unreadable symbols (which may be the Wingdings associated with W. D. Gaster, or Alphys's handwriting). The second drawer from the left contains a badge. The first drawer's contents change depending on some of the player's previous actions; it always contains a photo album with photos of a happy Sans along with many other people the protagonist does not recognize.

6. #6Papyrus

   Keys: Papyrus, Sans's younger brother, Sans's brother

   Papyrus is Sans's younger brother, a major character, and the second boss in Undertale. Papyrus wants to become a Royal Guard to gain fame and friends. He patrols and prepares many of Snowdin Forest's puzzles in hopes of capturing a human and earning his goal. Papyrus is a tall, perhaps anatomically inaccurate skeleton, with a skull more vertical and geometric than his brother. Being skeletal, many of his expressions incorporate a toothy grin. His eyes resemble vertical slits; his skeletal pseudo-brows form most of his expressions, as well as the corners of his mouth. He has eyeballs which show at times when he is experiencing strong emotions. Papyrus is relatively taller and slightly slimmer than his brother. For most of his in-game appearances, he wears his "battle body," an outfit that he created for a costume party. It consists of an orange-red cape, a white chestplate with a gold trim on the bottom, and blue briefs with a golden belt. A symbol that resembles that of Starman from the MOTHER series adorns the chestplate. He also wears red coquelicot gloves, each with a yellow trim, and red boots. Papyrus is a flamboyant skeleton who presents a confident, charismatic image of himself. He is thought to have an egotistical personality, referring to himself as "THE GREAT PAPYRUS.” He works hard and, despite his brash personality, is kind at heart. He is optimistic and brave, and is shown to be considerate and forgiving even when the protagonist beheads him in the Genocide Route. He is also occasionally oblivious and nonobservant, but can be cunning at times, as seen when he uses reverse psychology to trick Undyne into befriending the protagonist. He is thought of to be somewhat naive by other characters, but not dumb. He shows great bravery as even in the face of potentially imminent death, he drops his guard and spares the protagonist in hopes of driving them down a better path. Papyrus believes in others just as much as he believes in himself. He has so much faith in his abilities that he waited outside of Undyne's house all night and begged her to accept him into the Royal Guard. Seeing his persistence, Undyne offered to train him, but instead gave him cooking lessons. His confidence in himself and others is so great that he interprets direct insults towards him as the protagonist trying to make themselves look bad so he can hurt them easier, rather than the possibility that they dislike him. He cooks spaghetti from time to time, though many characters seem to think that he is not very good at it. One of the reasons for this is because Papyrus never ate spaghetti himself to complete the chef's guidebook to cooking by tasting their creation before serving. He, therefore, cooks spaghetti only because everyone else loves to eat it, indicating he does not play favorites. Since Undyne - whose results do not best Papyrus - teaches him, she is also responsible. He loves puzzles and japes, as shown by the numerous puzzles he prepares for the protagonist as well as his collection of "complex tomes about puzzle creation." Though advanced puzzles may seem cerebral, Papyrus also enjoys children's books and is somewhat childish with the decoration of his room. He also collects action figures. He has some unexpected skills besides cooking however, such as consistently high-caliber artistic prowess from things such as: being able to paint a rock formation to look exactly like a bridge, creating a snow sculpture to look just like himself but with musculature, to the various puzzle designs he creates for the protagonist. He also has a photographic memory for phone calls, and the ability to perform physics-breaking acrobatics. Papyrus seems to be strangely unconcerned about his own death, comically stating that "AT LEAST I STILL HAVE MY HEAD." right before dying, or be more worried about the protagonist's path in the Genocide Route. He mentions in a phone call that he would like to meet Death, although the meaning of this is unknown. Papyrus also watches Mettaton's TV shows, and admires Mettaton so much that he would move to Hotland, a region that he hates. Papyrus is implied to have a deep loneliness; he wants to join the Royal Guard in order to be popular and loved by the people of the Underground. Papyrus is shown to not get nearly as much positive attention (or any attention for that matter) from the people of Snowdin compared to his much calmer and more amiable brother, Sans. This is further implied by their mailboxes in which Sans's is packed with junk mail, while Papyrus's mailbox has only emptiness, even prompting him to claim that it is "[HIS] EMPTINESS, NOT YOURS." Papyrus exclaims to the human that he has never come across someone who is so much like him in taste, passion, and skill. He further exclaims that he "[DOESN'T] EVER WONDER WHAT HAVING LOTS OF FRIENDS IS LIKE." clearly projecting his lack of friends. This desire to be favored amongst the crowd runs so deep that Papyrus will change his opinion on something on the spot just to gel in with the majority, like with his opinion on Grillby's. And this desperation for a true friend leads Flowey to easily manipulate Papyrus into calling the protagonist's friends to the barrier room, although whether or not Flowey considers Papyrus a friend is vague. Despite all of this, Papyrus mentions that others depend on him to make them happy, so he hides his sadness to comfort them more effectively. Papyrus is also shown to have a level of kindness and understanding that no other character in the game possesses, as he is the only enemy with attacks that never kills the protagonist, only leaving them at 1 HP. This level of philanthropy is emphasized in the King Papyrus ending in which Papyrus is the only leader to take up a level of judgement upon fallen humans that is to not judge them as all good or bad, and that they get puzzles either way.

7. #7Royal Guard

   Keys: Royal Guard, Undyne, Doggo, Lesser Dog, Dogamy and Dogaressa, Greater Dog

   The Royal Guard are a group of monsters dedicated to defending the Underground, protecting Asgore, and searching for a human to acquire the last of the 7 SOULs. They are supposedly an "elite" group of guards, but many of their members appear laughably incompetent. Undyne, the leader of the Royal Guard, decides who becomes a member. Papyrus's dream is to become a famous member of the Royal Guard, but despite his surprisingly adept combat ability, Undyne secretly does not let him join as he is too kind and friendly, believing these attributes may get him killed in battle. The Royal Guard includes; Undyne (leader), Doggo, Greater Dog, Lesser Dog, Dogamy and Dogaressa, and Royal Guard 01 and Royal Guard 02. Doggo, Lesser Dog, Dogamy and Dogaressa, and Greater Dog are referred to as the "Snowdin Canine Unit".

8. #8Humans

   Keys: Humans, Souls

   Humans are a race in Undertale. They live on the surface of the Earth, beyond the barrier on Mount Ebott. The only humans seen in-game are the first human and the protagonist. Humans have lived on the surface ever since they won the war. Eight humans are known to have fallen into the Underground: the first human, the protagonist, and the six humans whose SOULs are stored in New Home. Humans as a whole are seen as evil by monsters, especially since Asgore declared to kill any human who enters the Underground, yet most monsters do not know what a human looks like. The job of patrolling for humans is entrusted to the Royal Guard. Humans indirectly affect the monsters' society. Waste from human society flows through rivers into the Garbage Dump. This waste has influenced monsters' technology and media; for example, anime and manga remain one curiosity to monsters. This waste has also distorted monsters' perception of human society, such as Undyne believing anime to be human history. Acculturation of human customs occurs as well, such as Mettaton's interest of keeping his resort's standards similar to those of humans. It's also shown humans are able to cast magic, due to using a magic spell to seal the monsters underground; from one of the humans being shown with a presumable magic staff, humans can be thought to use magic. Human bodies are composed of physical matter, as opposed to monsters' more magical bodies. Because of this, human SOULs are not attuned to their bodies like monsters are. This trait allows their SOULs to persist after death. The physicality of human bodies also allows humans to carry higher concentrations of determination than a monster.

9. #9Determination

   Keys: Determination, DT, Human Souls

   Determination is a power that allows SOULs to persist after death. The most determined being in the Underground is able to SAVE. Determination is naturally possessed by humans. Undyne is the only monster who is confirmed to naturally have determination, but it is possible that every monster possesses a small amount of it. But if a monster acquires a high concentration of determination, their body starts to melt, turning into an amalgamate. A being without a SOUL can gain the will to live if it acquires determination, a prime example being Flowey.

10. #10The War of Humans and Monsters

    Keys: The War

    The War of Humans and Monsters was a legendary clash that took place long before the events of Undertale. At the time, humans and monsters ruled the Earth. One day, humans attacked the monsters abruptly and mercilessly, out of fear of their only weakness: having their SOUL absorbed by a monster. Monsters were too weak to put up a fight; the SOUL of nearly every monster combined is only just as strong as the power of one human SOUL. Countless monsters were massacred, without a single human SOUL taken. Few monsters survived, one of which was Gerson. Eventually, the monsters surrendered, and the humans emerged victorious. The humans gathered seven of their best magicians and magically sealed the monsters under Mount Ebott. After the war, the monsters retreated into the deepest part of the Underground, which they called "Home." After a period had passed, fearing the humans no longer, they populated the rest of the Underground and made their capital in a place they called "New Home." Monsters mostly blamed the war on humanity and took a vengeful look at the human race. This bitterness, especially after the death of Asriel and his adopted sibling, led King Asgore to declare war against humanity, installing a policy to kill all humans that fell into the Underground and eradicate humans once the seven SOULs needed to break the barrier are collected.

11. #11Monsters

    Keys: Monsters, Underground

    Monsters are a very diverse race in Undertale. They dwell in the Underground beneath Mount Ebott, while humans live on the surface beyond the Barrier. Besides the protagonist, the fallen human and Flowey, most characters encountered in the game are monsters. The game mentions a few real-world animals, such as mice, spiders, and dogs. It is unknown whether those count as monsters. King Asgore Dreemurr rules all monsters in the Underground. After The War of Humans and Monsters, the humans from the Surface trapped the monsters underground. Despite the negative implication of the word "monsters," monsters in Undertale are not an evil species. It is even said that monster SOULs are made of love, hope, and compassion. Monsters are far weaker than humans, both in physical combat and regarding the strength of their SOUL. This inadequacy is because monsters are mostly made of magic, which in turn makes them attuned to their SOUL. The damage a monster receives from an attacker is dependent on both the monster's will to fight and the attacker's will to hurt. Monsters, however, can obtain an "unfathomable" amount of power when they absorb the SOUL of a human. Monsters come in numerous shapes and sizes. Most monsters physically appear as anthropomorphic, non-human beings (animals, natural/artificial objects, supernatural beings, etc.), with the most notable species of monsters including skeletons like Sans and Papyrus, ghosts like Napstablook and Mad Dummy and Boss Monsters like Toriel and Asgore. Monsters SOULs are upside down and wholly white. A monster's body is mostly made of magic and is attuned to its SOUL. When a monster gets old, they enter a state referred to as having "fallen down." A monster in this state lies immobile and dies shortly afterward.[5] When a monster dies, their body turns into dust. This dust is often spread onto the owner's favorite thing in funerals so that their essence lives on in their possessions. Monsters' bodies and SOULs are closely linked; when a monster dies, their SOUL is lost forever. Boss Monsters are an exception, as their SOULs exist outside their bodies for a few moments before shattering. Because of their magical nature, monsters' bodies cannot handle high concentrations of determination. When monsters are injected with it, their bodies liquefy and melt together. The Amalgamates are a clear example of this.

12. #12SOUL

    Keys: SOUL, Monster Soul, Human Soul

    The SOUL is the very essence of one's being, whether one is human or monster. It plays a crucial role in the progression and plot of Undertale. In the game, a human SOUL and monster SOUL together can cross the Barrier, while seven human SOULs shatter it entirely. A SOUL takes on the form of a heart. Human SOULs point down in most cases, and monster SOULs point up. The player moves the protagonist's SOUL with the arrow keys/joystick. The protagonist's SOUL can move freely in the Bullet Board, and the border encloses the SOUL. In menus, the SOUL indicates the selected option. During the enemy's turn in an encounter, the protagonist moves their SOUL to avoid attacks. If, due to enough failures to do so, the protagonist's HP reaches 0, their SOUL splits and shatters, resulting in a Game Over. However, during the battle against Asriel Dreemurr, the protagonist's Determination restores their SOUL to full HP if it reaches zero. The SOUL breaks as normal, the text "But it refused" displays, and the SOUL fuses back together. Also, none of Papyrus's attacks can deplete the protagonist's HP, instead causing the battle to end while Papyrus takes them to his shed. If the protagonist collides with hazards (such as lasers or Undyne's energy spears) in the environment, they enter a brief encounter where the antagonist attacks their SOUL. The protagonist's SOUL is red. However, SOUL Modes temporarily change its color. The SOUL of a monster is upside down and white. The protagonist sees monster SOULs on multiple occasions, such as when Asriel returns the SOULs to monsters' bodies after breaking the Barrier, or when Toriel or Asgore Dreemurr turn to dust and leave their SOULs behind. A monster's SOUL is weak and does not persist after death unless said monster is a Boss Monster. Monsters believe that love, hope, and compassion compose their SOULs. Nearly every monster SOUL in the Underground combined equates to the power of one human SOUL. A monster's SOUL is deeply attuned to their body. This is why a monster becomes weaker when an enemy gains EXP and LV, and why it becomes harder for monsters to fight when they are not inclined to do so. This trait is also why when a monster dies, their form dissipates as their SOUL disappears. Human SOULs come in several colors and are stronger than monsters' SOULs. For this reason, human SOULs persist after death. A human's SOUL is not the entirety of their being, but rather their essence, housed in a physical body. This is why humans are stronger than monsters when it comes to physical attacks. Alphys states that determination is a component of human SOULs, and she was able to extract it from the six fallen humans' SOULs. Due to determination, a human's SOUL is capable of maintaining its form after death. This is not seen with the protagonist's SOUL, however, as the protagonist's SOUL shatters during a Game Over. It requires the power of (almost) every monster SOUL to equate the strength and determination of a single human SOUL. It seems each additional human SOUL grants exponential power, as 1 human SOUL grants enough power to wipe out a village (as described of Asriel after absorbing Chara's SOUL). Meanwhile, with 6 human SOULs, Photoshop Flowey is able to completely overwrite the rules of battle, and (as stated many times) with 7 human SOULs, a being becomes a God and can do nearly anything, gaining powers such as existence erasure and significant shape-shifting as well as having infinite ATK and DEF thus being immortal. (If Asriel is attacked, it is always a MISS.) It also appears as though a being with seven human SOULs can mimic the magic of any other being, as Asriel after regaining his form as a boss monster thanks to said SOULs also regains his powers as one, such as fire magic. However, this may simply be because Asriel absorbed the souls of all the monsters in the Underground.

13. #13Barrier

    Keys: The Barrier

    The Barrier is a strong magical force in Mount Ebott. It is locked by SOUL power and separates the Underground from the Surface. The barrier is located behind the Throne Room in New Home, and appears to be a silent, endless room transiting from white to black. Somewhere within the floor are seven vials, six containing the six human SOULs. Due to the War, seven human magicians conjured it to protect humanity and keep monsters trapped in the Underground. Anything, including humans, can fall through the barrier and enter the Underground's Ruins, where Toriel generally finds them. However, only a being with the SOULs of a human and a monster can pass through the barrier and exit the Underground. The barrier can be broken, though it requires a huge amount of power equal to seven human SOULs, or six human SOULs and the SOULs of monsterkind. Only eight humans have fallen through the barrier: the first human, the six humans, whose SOULs were collected by Asgore, and the protagonist. When the barrier shatters, it is depicted as being a near-opaque white with a large crack before splitting apart. Beyond the barrier is a dark room with a sunlit patch of grass, and a purple arch depicting the Delta Rune.

14. #14Underground

    Keys: The Underground

    The Underground is the primary setting of Undertale. It is a large region within Mount Ebott that is separated from the Surface of the Earth. It houses the kingdom of Monsters, who are ruled by King Asgore, and formerly by his ex-wife, Toriel. The Underground has varying terrain and climates, and features five main areas: the Ruins, the frigid and wintery Snowdin, the marshy and cavernous Waterfall, the blistery and barren Hotland, and the Capital. The Underground's exit is blocked by the Barrier, which was placed by the Humans long ago. Anything and anyone can enter the Underground by descending into Mount Ebott. After the Humans defeated the Monsters in The War, the losing faction was banished into the Underground. A Barrier was erected to prevent the insiders from leaving, though outsiders could still freely enter. Wary of humans, monsters retreated into the Ruins and adapted Home as their first capital, living normal lives in the Underground from then on. Additionally, the Ruins was structured to contain diversions in the form of puzzles. At an unspecified point, monsters documented The War, regarding SOULs, and Delta Rune's prophecy on Waterfall's walls. One day, the first human ascended Mt. Ebott and tripped on a vine, causing them to fall inside and enter the Underground. The human was discovered by Asriel Dreemurr, the son of Asgore and Toriel, and was adopted into their family. The first human's presence brought hope to monsters. Eventually, no longer fearing humans, monsters ventured outside of the Ruins, populated the rest of the Underground, and made New Home their new capital. In contrast to Home, some monsters were content to settle at different locations than in New Home. From Waterfall, monsters acquired modern technology and discarded items from the Surface. At some point, the CORE was created by W. D. Gaster to convert electric power for the entirety of the Underground. Snowdin's blocks of ice is used to help keep the CORE from overheating. However, one day, the first human grew ill and requested to see the flowers in their home village. After they died, Asriel absorbed their SOUL and became a powerful entity that was able to cross the Barrier. He carried their corpse to the center of the human's village, which had a patch of Golden Flowers. The humans attacked Asriel, under the assumption that he had killed the human child. Refusing to retaliate, he returned to the Underground with the first human's corpse and died in New Home's garden where he succumbed to his wounds. Since then, Asgore became vengeful for his son and plotted to escape the Underground and declare another war against humans. He declared all humans who fall into the Underground be killed and their SOULs collected; with seven human SOULs, the Barrier could be shattered. However, the brutality of this decision disgusted Toriel. She relinquished her position as queen, as well as her marriage to Asgore. Asgore continued to rule the land on his own while Toriel exiled herself into the Ruins. Puzzles became a tradition to foil human attacks. Over time, six more humans fell into the Underground, all of which Toriel tried to shelter and care for. However, they all eventually left the Ruins and were eventually killed, their SOULs collected by Asgore. Eventually, the Royal Guard, led by Undyne, was structured by Asgore to patrol the Underground. Alphys, the new Royal Scientist, surveys the Underground through hidden cameras to control Hotland's puzzles, and to warn and evacuate monsterkind if needed. An eighth human, the protagonist, had then fallen into the Underground. Unlike the predecessors, the protagonist's Determination carried them through many obstacles the Underground had presented, even managing to befriend or kill many monsters. Eventually, the protagonist manages to reach Asgore, where he stands before the Barrier. One of few events occur depending on the protagonist's actions: On the Neutral Route, the protagonist and Asgore battle. The latter is defeated, after which Flowey intervenes and absorbs the six human SOULs. The protagonist defeats Flowey and is somehow transported outside the Barrier after the event, where they leave the Underground. Sans then calls the protagonist and tells them the fate of the Underground, which is either peaceful or grim depending on who was killed. On the True Pacifist Route, Asgore is stopped by Toriel and all of the protagonist's friends, but are then ambushed by Flowey, who proceeds to absorb the six human SOULs as well as the SOULs of all the monsters in the Underground, reverting to his true form, Asriel. However, with all the SOULs, Asriel gains compassion and ultimately loses the will to fight, and instead he uses their power to shatter the Barrier. Having returned the SOULs, Asriel leaves, knowing that he will revert to Flowey, and begs the protagonist to forget him. The monsters are free to leave the Underground and live peaceful lives on the surface. On the Genocide Route, certain monsters try to stop the protagonist's murderous rampage while Alphys leads the evacuation. Upon reaching Asgore, the protagonist instantly defeats him with one blow and proceeds to destroy Flowey mercilessly. The first human appears before the protagonist and explains that their determination brought them back to life. With the protagonist's guidance, they realized that the true purpose of their reincarnation was to gain power. The first human then, with or without the protagonist's consent, uses that power to destroy the world.

15. #15Boss Monster

    Keys: Boss Monsters, Toriel, Asgore, Asriel

    A Boss Monster is a special species of monster who distinctly has SOUL persistence. Known Boss Monsters rule over the Underground. Although all Boss Monsters are also bosses in Undertale, not all bosses are Boss Monsters. All Boss Monster encounters activate Serious Mode. The game's lore explicitly states two things: Boss Monsters' SOULs persist briefly after death, and mature Boss Monsters only age when their offspring does. This explains Asgore and Toriel's longevity as their son, Asriel, died at one point, and they therefore cannot biologically age. When a Boss Monster dies, their body turns to dust; however, their SOUL, in an upside down heart shape, lingers for a few seconds before shattering. Similar to other monsters' SOULs, the SOULs of Boss Monsters are white. There are three known Boss Monsters, all of a royal bloodline: Toriel, Asgore, and their son, Asriel. Although not necessarily intrinsic characteristics of Boss Monsters, the three of them share several traits. Physically, their heads resemble Nubian goats, and have a pair of horns, long droopy ears, and visible fangs. All three have anthropomorphic bodies and paws at the end of their limbs. The Dreemurrs also share an affinity for fire magic, and wear the Delta Rune emblem.

16. #16Eight Humans

    Keys: Human Souls, Chara, Seven Human Souls, Eight Humans

    The Eight Humans are the humans from the Surface who fell through the Barrier on Mount Ebott into the Underground. Among them are the first human, the protagonist, and the six other unnamed human SOULs that Asgore has collected. Each SOUL Mode and colored attack type corresponds to one of the seven humans that fell after Chara. Before the events of Undertale, seven human children fell into the Underground and died through their journey. Asriel found and befriended the first human. The royal family adopted the human and treated them as a second child. The human became deathly ill by eating buttercups and requested to see the Golden Flowers from their village, but the monsters could not fulfill this request due to the barrier. After the human died, Asriel absorbed their SOUL, and the human, who also had control of the shared body, carried their own empty body through the barrier to their village. Ultimately, the humans on the surface fatally wounded Asriel, thinking he took the human child's life. Asriel retreated back to the Underground with the first human's body, where he ultimately collapsed and died in the throne room in New Home. After his death, Asgore declared war on humanity and pledged to kill any human that fell into the Underground. Toriel then took the first human's body and left for the Ruins, as his actions disgusted her. Some time after the first human fell in 201X, six humans climbed Mount Ebott, fell into the Underground, and died. It is unknown how far they had made through the Underground. Each of them had their associated items, but it is unknown why they climbed the mountain or how the items were scattered. Asgore collected each of their SOULs for later use, placing the humans' bodies in coffins in the basement near his Throne Room. The protagonist is the eighth human to fall, and their SOUL is the last needed to break the barrier permanently. The coffins holding the bodies of previous fallen humans are found in New Home. The first human's coffin is empty, as Toriel took their body with her to the Ruins. Toriel presumably buried them under the Golden Flowers flowerbed, which the protagonist first appears on at the start of Undertale. Near the end of the Neutral Route, Asgore reveals the six human SOULs, which Flowey ultimately absorbs to become Omega Flowey. During six segments of Omega Flowey's fight, each human SOUL attacks the protagonist's SOUL, using attacks themed after their associated items found throughout the game. Pressing the ACT button that appears during each segment causes the protagonist to call for help. Each SOUL then answers the protagonist's call and aids them with healing green attacks. Flowey's defense drops slightly every time the protagonist calls to one of the SOULs for help. After the protagonist defeats him, Flowey tries to repeatedly reload his SAVE to reload the game and finish the protagonist, but the human SOULs eventually intervene and betray him, reverting him to his original form. During the Omega Flowey fight, the SOULs attack the protagonist with their related weapons found throughout the game. When playing the Ball Game, the protagonist may achieve any of seven flag colors, all with a different message and each corresponding to one of the SOUL colors (Red, Light Blue, Orange, Blue, Purple, Green, and Yellow.) At the end of the Genocide Route, the fallen human appears in person. It is unknown whether they are speaking to the player or the protagonist. They say that "determination" and a "human SOUL" brought them back from death, and that with guidance they realized the purpose of this reincarnation was power. The fallen human attacks the screen, dealing unreadable levels of damage, and the game closes (on the console versions, the screen blacks out for 30 seconds until the howling wind plays). After launching it again, the fallen human appears after ten minutes and offers to recreate the world in exchange for a human SOUL, most likely the protagonist's.

17. #17Delta Rune

    Keys: Delta Rune, The Angel

    The Delta Rune is an emblem representing the Kingdom of Monsters. It is an orb between two wings and three triangles beneath it, with the middle triangle inverted. It is first seen on a Boss Monster's robe during Undertale's introduction scene, and secondly on Toriel's robe, foreshadowing her role in the story. The emblem or portions of it are depicted in various areas, armor, and occasionally, monsters visually resemble it. The Delta Rune is said to predate written history. However, the original meaning has been lost in time. What is certain is the bottom triangles symbolize the monsters of the Underground. The winged circle is believed to represent the "angel," which is prophesized to be the one that has seen the Surface and will return one day to depopulate the underground. This prophecy has two interpretations: one where the "angel" destroys the barrier and brings freedom to the monsters, and a more recent outlook on it, where it is an "Angel of Death" that kills everyone in the Underground, thus "freeing" them from the mortal realm.

18. #18SAVE

    Keys: SAVE, SAVE Stars

    In Undertale, SAVE is the in-universe name given to save files and the ability to overwrite them. There is one SAVE slot in the game (one per user), which can be overwritten by interacting with SAVE Points or by autosaving. In the dialogue, "SAVE" is noticeably written in capital letters, and it can be conjugated. A SAVE can be loaded via the game's menu. The game automatically loads the most recent SAVE whenever the protagonist's HP reaches 0. Meta knowledge plays a heavy role in this since the protagonist and other characters have memories of events that occurred before resetting their SAVE. For example, Toriel remarks that speaking with the protagonist is like speaking with an old friend, while Papyrus feels that they look familiar. If the player tries to load the SAVE in an inaccessible room (if the "Dogcheck" was not turned off) or with corrupted data, the game shows the Annoying Dog in the middle of a black screen, rendering the game unplayable until it is fixed with a functional room or a new SAVE.

19. #19RESET

    Keys: RESET, True RESET

    The Reset function is found in the game's menu. This function erases most information stored in a SAVE, such as the protagonist's LV and EXP; resetting, however, does not erase certain variables such as the name. Similarly to loading a SAVE, some characters in the game act differently after a reset. A True Reset is a function available after completing the True Pacifist Route. It erases most data from the undertale.ini file, exceptions including the Mysterious Door opening and border data on console. The post-Genocide state is in a separate file and unaffected by even a True Reset. If the Genocide Route is completed, the First Human destroys the world. They then offer the player to recreate the world in exchange for their SOUL. Other than manipulation of the files using a file editor, this is the only way to reset the game. However, accepting this offer also activates a permanent flag in the game's files which affects all subsequent True Pacifist and Genocide endings. In the universe of Undertale, SAVING the game manipulates the timelines. The use of this ability is exclusive to the character with the highest determination in the Underground. The first character known to acquire this ability is Flowey, because of the determination he was injected with. His ability to SAVE is lost when the protagonist enters the Underground, as the protagonist's determination is greater than his. Flowey is also noticeably the only character who retains full knowledge of the protagonist's actions before and after loading a SAVE, as opposed to other characters who only have vague memories. At the end of the Neutral Route, Flowey regains his ability to SAVE after absorbing the six human SOULs, and uses it to overwrite the protagonist's SAVE. His use of the SAVE ability in this state is analogous to save-states, which he uses in the battle to disorient the player. Another noticeable difference is the number of save slots; while the protagonist can only use one SAVE file, Photoshop Flowey uses four (SAVE files 2, 3, 6, and an unspecified one).

20. #20SAVE Point

    Keys: SAVE Point, SAVE

    A SAVE Point is a place where the protagonist can SAVE the game. Interacting with a SAVE Point fully restores HP and usually expresses the protagonist's current thoughts and determination. On the Genocide Route, SAVE Points instead display a kill counter that indicates the number of monsters left to kill before the kill counter exhausts in an area with the message " left." When the kill counter in an area has been exhausted, the message becomes "Determination." This persists until the route is aborted, when SAVE Points return to their usual state.

21. #21Dimensional Box

    Keys: Dimensional Box

    A Dimensional Box can be used to store items, as the protagonist can only carry up to 8 items at a time in their Inventory. There are a few physical boxes before Alphys upgrades the protagonist's Cell Phone in the Neutral and True Pacifist routes. After the protagonist's phone is upgraded, two Dimensional Boxes (one of which is the normal box) appears in the phone list and can be used to move items around. Dimensional Boxes A and B can be accessed at any point in the game via Cell Phone, whereas the physical Dimensional Boxes only contains items from Dimensional Box A. If the protagonist is on the Genocide Route, Alphys does not show up to upgrade the protagonist's phone; however, three additional boxes are placed to compensate for this. Items cannot be directly swapped between a box and the protagonist's inventory, only deposited and withdrawn. If all boxes and the player's inventory are full, and the player wants to exchange an inventory item for a box item, they must consume or drop an item first to make the switch possible. The protagonist cannot use the dimensional boxes if they do not have any items in the inventory nor in the box. Each box can store up to 10 items, so in the True Pacifist and Neutral routes, the protagonist can be in possession of a total of 30 items (2 from equipped items). While in the Genocide Route, the protagonist can have a total of 20 items. The first time the protagonist opens a box (the first of which is located in Snowdin Forest), it contains a Tough Glove, which can be taken free of charge.

22. #22Lesser Dog

    Keys: Lesser Dog, Snowdin Canine Unit

    Lesser Dog is a miniboss the protagonist encounters in Snowdin Forest. It is later found as an NPC in Grillby's. It is a member of the Royal Guard. Lesser Dog's fur is a light cream color, and its red tongue appears to be perpetually lolling out of its mouth. It wears gray, presumably metal armor with a darker gray band around the waist area. It holds a sword and a shield with the Delta Rune. Like several other dog characters, Lesser Dog becomes overexcited from physical attention. It is capable of extending its neck at a seemingly limitless rate when stimulated by being pet. Lesser Dog appears to enjoy spending its time off sentry duty by playing card games (namely, poker and go fish) against itself at Grillby's. When interacting with it at this time, the text mentions how it appears to be losing. While waiting around its sentry post in Snowdin Forest, Lesser Dog spends a lot of its time making snowdogs, mostly with necks in similar lengths to its own. A faun monster standing near the post notes that it seems to get overexcited in the construction of the figures and never finishes them. It may be that Lesser Dog is able to achieve focus by being pet, as after being pet by the protagonist its statues become more complete. The more pets it receives, the more statues Lesser Dog creates around its sentry post, until they all become broken statues of its very long neck when it is pet enough times or has the Stick thrown at it. In this case, the faun states that a dog came by full of excitement and started building sculptures, but its neck kept growing and it kept adding snow to the sculptures until they broke. On the flip side, if Lesser Dog is killed, its sentry post is accompanied only by a pile of formless mushy snow.

23. #23Doggo

    Keys: Doggo, Snowdin Canine Unit

    Doggo is the second miniboss in Undertale. He is a member of the Royal Guard, and he waits at his sentry station in Snowdin Forest. Doggo is the first monster to use blue attacks in an encounter. If spared, the protagonist can find him as an NPC in Grillby's. Doggo appears to be a bipedal dog monster. He wears a cotton-candy-pink muscle shirt with a picture of a dog on the front, a ninja-like mask, and leopard-print stretch pants. He also has a brown belt, and white tail. His lower paws appear to be bare. He dual wields short swords similar to the typical King playing card. Doggo's most notable feature is his inability to see stationary objects; he can only sense things that are moving, and he dislikes things and people that appear or transport themselves without physically moving (such as Sans). He seems to be occasionally unsure of himself and, if he sees something, checks to see if it moves again. His in-battle description notes that his hobbies include "squirrels," which refers to a common dog's habit of chasing squirrels. He enjoys being pet by the protagonist, which can compromise his job as a sentry. It is hinted that Doggo smokes dog-treats similar to the conventional cigarette. If the protagonist kills Doggo and spares Dogamy and Dogaressa, interacting with Dogaressa prompts her to ask, "Where's Doggo? I hope he didn't get lost again." If the protagonist kills all other dog enemies, Doggo assumes that his friends are playing a prank on him by not moving.

24. #24Dogamy and Dogaressa

    Keys: Dogamy and Dogaressa, Dogamy, Dogaressa, Snowdin Canine Unit

    Dogamy and Dogaressa, collectively referred to as "Dogi", are a pair of minibosses encountered in Snowdin Forest. If spared, they appear later as NPCs in Grillby's. They are members of the Royal Guard. They are near identical in appearance, both having round snouts, floppy ears, and muscular builds covered by dark hooded robes with the face of their spouse printed on the front. Their main differences in appearance being Dogamy's thick lowered brow, cowlick and pseudo-mustache, and Dogaressa's emphasized eyelashes. In battle, they both wield long battleaxes, with eyes that show features imitating those of their owners. They primarily use their sense of smell to detect others, but not much else, implying their eyesight is inferior, much like Doggo, who either of them may be biologically related to. Despite this, they love each other dearly, and this is shown in their attacks in battle, using heart-shaped attacks and coordinating their axe strikes to form a heart-shape with the gaps between their blades. If either is killed in battle, the other's shirt is shown to have their spouse's picture on it, proving their love further. Each Dogi reacts differently towards the death of the other, with Dogamy falling into hopelessness and despair, while Dogaressa makes threats in a fit of rage, though both show their resentment toward the protagonist by growling and refusing to be pet. Prior to the events of the game, the couple came #2 in the "Nose Nuzzle Championship '98," having lost the number one position to Toriel and Asgore. If the protagonist kills Dogamy and Dogaressa, interacting with Doggo in Grillby's leads him to wonder where they are, complaining that he cannot play alone because Greater Dog will win the card game matches. If the protagonist kills all other dog enemies, Dogamy comments that the place smells "quiet." Dogaressa comments that Grillby's is lonely and asks the protagonist if they want to play a card match with her should her friends not show up, although the protagonist is not given the option to.

25. #25Greater Dog

    Keys: Greater Dog, Snowdin Canine Unit

    Greater Dog is a guard dog and a miniboss encountered in Snowdin Forest. It can be later found as an NPC in Grillby's when the protagonist spares it in battle. It is a member of the Royal Guard. Greater Dog's fur is wholly white, and it wears mantle-gray armor adorned at the wrists with apparently functional dog faces, much like the spear weapon it holds during battle. However, Greater Dog itself only fills the smallest neck portion and the tail area of the armor while controlling the rest of the suit through unknown means. Notably, when it jumps out of the suit, its "hands" seem to withdraw into the armor and don't reappear when it hops back in backwards. Greater Dog is incredibly affectionate and constantly seeks attention; Dogamy even warns the protagonist of facing the full brunt of Greater Dog's playful attitude if they are not careful of where they sit down in Grillby's bar. It sits with most of the other dog characters in Grillby's when it is not on sentry duty and appears to be unable to say much more than a sound effect while making a pleased expression (though this expression becomes a frown if both Doggo and the Dogi have been killed).

26. #26Grillby

    Keys: Grillby, Grillby's

    Grillby is a fire monster, and owner and proprietor of Grillby's. He wears glasses and a black, long-sleeved suit with a white collar, a gray bow-tie, and black buttons. While generally very quiet, he commends the protagonist for a "good job" during the True Pacifist Epilogue. If Papyrus is killed, he gets nervous as Sans is his best customer and he has not shown up all day. Grillby does not speak until the True Pacifist Epilogue. Red Bird tends to speak for him, pretending to translate, which is revealed in the Epilogue. Due to his physiology, he has a fear of water. Grillby used to live in Hotland, but moved to Snowdin because he prefers the cold (ironically, for a fire elemental). He heats drinks by hand.

27. #27Last Corridor

    Keys: Last Corridor, Judgement Hall

    The Last Corridor is a corridor between Asgore's Home and New Home's Throne Room. Sans appears here to converse with the protagonist before they confront Asgore. After walking halfway through the corridor, Sans appears as a silhouetted figure, paralleling their first encounter with him in Snowdin. He initially speaks without his typeface and explains EXP and LOVE. Sans then asks the protagonist to look within themselves and question if they have done the right thing. After a moment, he comments that it does not matter what the protagonist said, so long as they were honest with themselves. Loading a SAVE and hearing Sans's introduction again prompts him to judge the protagonist on their earned EXP. If the protagonist gained no EXP in a Neutral Route, Sans abridges his introductory dialogue and comments on their lack of LOVE. After this judgment, reloading a SAVE and talking to Sans prompts him to offer a secret codeword. After repeating this process a few times, the protagonist obtains the key to Sans's room. If the protagonist killed Papyrus, Sans suspects that they may have some sort of "special power" and questions the protagonist if they should use that power to do the right thing. Regardless of their answer, he reminds them about his dead brother and ends the judgment there. Sans does not judge the protagonist on their EXP and LOVE, and this sequence repeats if the protagonist reloads their SAVE. After his dialogue, Sans vanishes, and the protagonist can progress. In the Genocide Route, Sans skips judgment and warns the protagonist to not step forward. In the encounter, Sans attempts to stop the protagonist, as he believes they are the entity that ends the timeline. After defeating Sans, the protagonist can progress to the Throne Room. The Last Corridor is a linear, closed off yellow-hued room, featuring the Delta Rune being depicted atop the corridor entrances and windows. White light shines through the mosaic windows, and Greek pillars border the corridor in both the foreground and background.

28. #28MTT Resort

    Keys: MTT Resort, Hotland, Mettaton, CORE

    The MTT Resort is a hotel and entertainment center run by Mettaton in Hotland. It is directly connected to the CORE. If the protagonist does not kill Papyrus, Sans invites them to dinner at the Resort's restaurant, telling a story about how he contacted an old woman through the door separating the Ruins from the rest of the Underground. He says that they used to make bad jokes for a long time, and promised to her that he would protect any human entering the Underground. There is an elevator in the lobby that leads to New Home, but it is always either broken or in use if the player tries to use it. There are four doors to the right of the lobby requesting room service. To the left of the lobby is a restaurant, and nearby is a stage that holds performances of comedians such as Sans and Snowdrake's Father. Inside the resort is the MTT-Brand Burger Emporium, where Burgerpants can be found. Here, one can buy healing items that boost ratings during the fight against Mettaton EX.

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