Rei

1. #1Black mud

   Keys: Black Mud

   This mud is sin made manifest and it carries corruptive properties. All, but the most strong willed of beings touched by the mud will be driven mad. These are corrupted into darkened versions of themselves who will swear themselves to your services. Even a Seraph could be corrupted should you cover them in enough of this mud. You can create the mud in massive quantities potentially allowing you to drown the entire world in mere days. Your ability to create this is only accelerated as you become surrounded by chaos and evil.

2. #2Dragon's Breath

   Keys: Dragon's Breath

   You gain two new glands in your mouth, which you can easily 'breath' out two different fluids, which will rapidly become gaseous. Alone, the chemicals are inert, however, when combined, they will rapidly ignite, even without external oxygen, thanks to it being an oxidizing reaction. This allows you to essentially breathe out a plume of fire, similar to the mythical dragon. Unfortunately, due to the size, they are limited to roughly 10 consecutive seconds in one day, creating up to a roughly two meter long flame. The flame itself reaches about 500 degrees Celsius, being orange, yellow. You are instinctually only capable of spewing your flames as you exhale, to ensure that the gaseous substances don't ignite inside you.

   As a bonus, your skin and hair, particularly your lips, as well as your eyes, become slightly more heat-resistant, particularly against heat radiation. As such, your eyes might become slightly reflective in bright light, though predominately in the infrared spectrum. The outside of the glands contain a third, neutralizing component, ensuring that damage to them isn't catastrophic.

3. #3Intense Breaths

   Keys: Intense Breaths

   Despite what should be physically possible, you can increase the intensity of the flame anywhere between the natural 500 degrees, and 2000 degrees. Not only that, but your face, as well as the inside of your mouth, can now withstand those temperatures, without any additional changes, with the rest of your body being able to withstand anything up to 200 degrees. Lastly, the flames you produce will now harmlessly disperse around you, never harming you, even though you might not have any additional protection against the heat.

4. #4Danger Sense

   Keys: Danger Sense

   You have a mild form of danger sense, able to sense danger to you in your immediate surroundings. While you have a rough idea of how likely the danger is, you do not know where the danger is coming from, nor how to reduce it. For example, while a loaded gun in your presence might tingle it, a gun pointing in your general direction will cause a much greater response. This leaves you with what appears as a mild, but constant anxiety.

5. #5Precognitive Reflexes

   Keys: Precognitive Reflexes

   Your senses are also able to perceive 0.1 second into the future, allowing you to react to things just before they happen. You only sense what you would've sensed if you didn't have this power, updating every 0.01 second.

6. #6Welding Claws

   Keys: Welding Claws

   You can create small, intense flames one centimeter away from your digits. You can summon either one at a time, or multiple, and each flame can be between one and three centimeters long. The flames can 'burn' between roughly 200 and 2000 degrees Celsius, but produce no emissions, as they aren't true flames. Your hands also become able to resist the temperatures, and the flames will fizzle out if you’re about to hurt yourself with them.

7. #7Mind Fire

   Keys: Mind Fire

   You gain one of the simplest form of psychic attacks: a 'bolt' of chaotic psychic energy, that harms the body of those with psychic energy, or in another case, sentient beings. While not the most potent of attacks, the fact that it ignores physical barriers, including armor of most kind, is very difficult to protect against, and homes in on the psychic signature of the target, makes it a great 'sure hit' ability in a fight. Notably, it is also one of the few psychic attacks where a strong willpower does not help to protect against it, only your physical constitution matters. Using it takes a second of concentration, the ability to 'see' the target, and some form of mnemonic action to direct it. Afterward, it takes a few seconds before you can safely form another. As you grow more skilled, the need for a mnemonic, and the time between uses, will shrink, though never completely disappear.

8. #8Telekinesis

   Keys: Telekinesis

   The power to move, manipulate or otherwise interact with matter/energy without physical means. You can currently lift as much as your body can.

9. #9Fleshy Book

   Keys: Fleshy Book

   You find a strange and grotesque looking tome in your hands. The cover seems made from dry flesh, and in the center of what you think is the front resides an eye. As you stare into the eye, it stares back, and you feel a pressure in your mind, though nothing ever comes of it. Inside the tome are strange, ever-changing symbols that your eyes simply gloss over. By having the eye stare into someone else, they will quickly become unnerved, but appear to forget about the book as soon as they stop looking at it, though the unease lingers for a while longer. It will disappear if you leave it, but somehow always return to your side once you think of it. Sometimes the eye will look somewhere else, staring at nothing.

10. #10Steel dagger

    Keys: Steel Dagger

    You gain a relatively simple looking steel dagger. At first glance, there's nothing special about it, other than how balanced it feels in your hand. However, it does not lose its edge, nor does it ever break or rust, completely invulnerable. This small blade is quicker and sharper than any eagle’s talon. Most of all it is silent. Throats slit, and lifeblood spilt will never cause noise to reveal you, flowing through flesh like a moonbeam on greased silk.

    Whether in hand or thrown it also seems preternaturally good at striking the most vital spots on an enemy. While it doesn't cut better than a normal dagger, it can handle strength that no other weapon could, it will never be the weak link. It will appear nearby, easy for you to find, potentially even clattering to the ground next to you, when you wish for it. To get rid of it is as simple as throwing it away or leaving it behind.

    Perhaps I was wrong. With a blade like this there is certainly cause to believe you are more of an assassin than a thief.

11. #11Verg Avesta

    Keys: Verg Avesta

    『Verg Avesta』 Rank: D NP Type: Anti-Personnel Falsely Transcribed Creation. A pseudograph copy of the Avesta, the Zoroastrian scripture. A primitive curse that returns wounds suffered by its wielder to their opponent. ...Which sounds great, but any fatal wound will kill him before it can activate, which means that he needs a wound "just barely less than fatal" for it to work. He cannot defeat enemies on his own, and after using this Noble Phantasm, he needs a partner to defeat the enemy for him. Truly the weakest.

12. #12Thief's Satchel

    Keys: Thief's Satchel

    A small satchel easily either slung over one’s shoulder with a strap or hung upon your waist. It can store the equivalent of a small rooms worth of items at any one time, producing whatever it is that you reach for within it into your grasp instantly. Items inside will never be harmed by the outside conditions such as sun or rain, stored safe and untouched. Whatever strange magic seems to grant it these abilities seems to have a strange and fickle sense of humor. You'll occasionally find small trinkets evocative of your adventures while carrying this appearing out of nowhere inside. Perhaps your satchel is merely fond of nostalgia. It shall always find its way back to you upon the tides of fate, and its contents will similarly be protected from being pilfered by those who just so happen to find it.

13. #13Akari

    Keys: Akari Nakamura, Akari

    Rei's twin sister

    Akari, a petite 8-year-old, exhibits a striking contrast of dark complexion against her unkempt, wavy white hair that often falls into her captivating red eyes, framed by long lashes and hidden behind large black spectacles. Her delicate features are adorned with mystical glyphs, adding an air of enigma to her slender, athletic build. She wears an unbuttoned black blazer over an off-white sweater, paired with dark blue jeans and brown boots, with black bandages on her forearms and shins. Akari's tight, barely-there pubic area and small 29-inch bust complete her youthful yet captivating appearance.

    Despite her noble demeanor, Akari is a reclusive NEET with crippling social anxiety, preferring the comfort of her indoors world to the outside. However, she displays a cold efficiency when required. She delights in being pampered, quiet environments, reading, deep conversations, animals, nature, logic, simple pleasures, learning, and strategy games. Akari's love for her brother Rei knows no bounds, and she finds solace in his presence. Her dislike for attention, crowds, being put on the spot, and criticism stems from her deep-seated insecurities. While generally kind, her sadistic tendencies emerged during their time together, hinting at a darker side beneath her gentle exterior. With an above-average libido, Akari can restrain her desires but craves satisfaction within two orgasms. She is sexually attracted to Rei and harbors yandere-like feelings for him, drawn to his various kinks and appearance regardless of how he behaves.

14. #14Past guilt

    Keys: Past Guilt

    Drawback: Past Guilt Description: Your twin sister always was the best at everything. So beautiful, so talented, so strong. Much more than you, at least that’s how you always saw it. She’d encourage you to catch up to her and be the best you could be but one day, something terrible happened. Your twin sister was hurt badly, changing her forever from what she used to be. Instead of that confident, powerful, wonderful person…she became nervous, shy and even weaker than you. Barely more than a normal person. You thought it was your fault, no matter the actual cause, and promised her that you’d never let her get hurt again. But poor sis is a very unlucky sort, getting drawn into danger despite her shy nature now, so you’ll need to make sure she stays safe. If your sister dies, you might as well die yourself.

15. #15Depression

    Keys: Depression

    Drawback: "Depression" Description: You gain a "mild" amount of chronic depression. It doesn't make you feel sad, or prevent you from being happy, but you tend to feel a sense of apathy to doing anything on your own, requiring external stimulus to keep you going. You're not suicidal, you just have trouble feeling anything. You can treat it, but be careful of falling back into it.

16. #16Something's off

    Keys: Something's Off

    Drawback: "Something's Off" Description: There's something off about you. Everyone you meet will have a slight negative first impression of you, though this can be slightly alleviated by an otherwise good impression. As long as you show that there's nothing wrong, people will likely dismiss it, though it can be bad in a stressful situation. Just try to avoid misunderstandings, as things can easily spiral out of control.

17. #17Angry mango

    Keys: All the World's Evils

    Drawback: "All the World’s Evils" Description: you are a young child condemned as a sacrifice for all of the world's evils so that no one else would suffer. You will endure horrific suffering as a result of this. you have become a living embodiment of sin and evil. This is a cursed power. This however, has bestowed you with a number of dark powers. They are mainly demonstrated through your ability to manipulate Black Mud.

    Aside from the mud itself, you are still an embodiment of sin. As long as evil exists within the world so shall you. You may be struck down, but you will merely return shortly afterwards. Third, as the embodiment of sin any act of sin grants you power and grants you a foothold in the hearts of those who commit such acts. The greater the sins they have committed the greater your reach becomes within them. Additionally any beings related to sin will fall under your sway. Lastly, any ability that is classified as evil or dark becomes far more effective in your hands.

18. #18Lingering Phantom

    Keys: Lingering Phantom

    Drawback: "Lingering Phantom" Description: You are haunted by the spiritual remnants of an unknown entity. They interfere with your decisions, occasionally influencing your actions drifting them to a purpose that only the entity would know.

19. #19Fuyuki Fire

    Keys: Fuyuki Fire

    FLASHBACK — Rei’s POV

    The world is burning.

    That’s the first thing I remember— not the colors, not the screaming, but the smell. Thick and chemical, copper on my tongue. Ash in my lungs. The sky peeling open like rotten fruit.

    I was six. I didn’t know what dying felt like, but I knew what it looked like.

    It looked like Akari, tiny hands gripping mine so hard I thought our bones would fuse. It looked like our home melting into fire. It looked like shadows laughing in the blaze.

    I remember letting go.

    Not of her, never her.

    Of myself.

    Everything else--my name, my fear, my voice-- I threw it all into the fire just to survive. To protect her. To be something that couldn’t burn.

    And then came the void.

    Not smoke. Not unconsciousness.

    A pit. A cold so ancient it whispered. It hurt to listen to.

    “Do you want to live, boy?” “Will you bear it?” “The curse of hatred, the wound of betrayal, the suffering of mankind—”

    It didn't feel like a question.

    It felt like a hand on my heart.

    Dark fingers. Long. Endless.

    Crushing, squeezing until there was barely anything left.

    And I, a hollow echo of a child, whispered yes.

    Something laughed.

    “You’ll become what they all fear. The vessel of resentment, the avatar of the world’s ugliness. You will be hated and not understand why.”

    A mouth formed out of nothing.

    “Times up.”

    I was falling. I remember that.

    But then— a miracle.

    Warmth. Light.

    A voice-- not cruel or cosmic. Just… small.

    “Rei—!”

    Ah, Her voice.

    And then her tears, falling on my face. Tiny arms around me. Hands glowing gold.

    Burning, not like fire. Burning like salvation.

    The darkness screamed, twisted, recoiled.

    I opened my eyes. And I saw her. Akari.

    Golden light bleeding through her hands.

    Like something holy.

    Something I didn’t deserve.

    But she held me anyway.

    And I—a hollow excuse of a human—held on.

    ---

    PRESENT — MORNING

    Rei jolts upright in bed.

    Cold sweat on his brow.

    The same dream again.

    He sits in the early morning quiet, breathing hard.

    Birdsong outside. The faint sound of Akari boiling water in the kitchen.

    He looks down at his hands. They don’t glow. They never did.

    But hers might. Someday.

    He mutters to himself, half-aware.

    “…I’m still here. Guess that counts for something.”

    Then he stands up, stretches the weight out of his limbs, and starts getting ready for school.

    Same uniform. Same streets. Same ache.

    But always one light at the end of it.

    Her.

20. #20Past

    Keys: Background, history, past, memories

    Fuyuki Fire – Age 6 Rei and Akari were among the many children caught in the devastating inferno of the Fuyuki Fire, an event that scorched the city and left deep scars on those who survived. As the flames closed in, Rei—terrified and overwhelmed—made a silent, desperate wish to survive at any cost. In doing so, he subconsciously cast aside his emotions, memories, and sense of self, becoming a hollow shell clinging to one final tether: his twin sister, Akari.

    In the depths of near-death, Rei encountered a shadowy presence, an entity calling itself Angra Mainyu—the “Embodiment of All the World’s Evils.” It offered him power, a role, a curse: to become its Avatar. Half-lucid and nearly lost, Rei agreed.

    Yet a miracle disrupted the pact's completion.

    As he hovered between life and death, Akari found him—burned, barely breathing—and held him close. In her despair, a golden lightbawakened within her hands, a mysterious force that countered the festering corruption in Rei’s soul. This act of desperate love became an anchor. Rei survived—not just physically, but spiritually—saved from total consumption by the dark.

    Though he remained touched by Angra Mainyu, Rei awoke with just enough of himself intact. A seed of something monstrous lay dormant within him, restrained by the quiet warmth of Akari's presence.

    ---

    Recovery and Daily Life

    After the fire, the twins were left without family. Instead of being separated, Akari refused to leave Rei's side, fiercely protective despite her own trauma. They were adopted by a mage-affiliated benefactor who offered them sanctuary in a remote area of Fuyuki City, away from the prying eyes of the Mage’s Association.

    While Rei grew silent and eerily detached, Akari shouldered the weight of their emotional recovery. She took care of him, helped him eat, sleep, function—be human. She was his voice when he couldn’t speak and his conscience when he didn’t feel. Yet even she could see the shadows still curling behind his eyes.

    Rei’s strange aura and the occasional flickers of hate-born energy around him went unnoticed by normal people but were felt keenly by the magically sensitive. Akari, meanwhile, began to manifest her own magical talent—a light-based thaumaturgy that seemed to radiate healing and ward off corruption, as if her soul was constantly pushing back against her brother’s affliction.

    ---

    Honnamura Academy

    By the time they turned 16, Rei and Akari had grown into stark opposites. Rei was quiet, blunt, and strangely composed—a spectral presence with razor focus. Akari was warm, cheerful on the surface, and deeply empathetic, though she carried silent fears about the burden she could never truly put down.

    They enrolled together at Honnamura Academy, Despite his isolation, Rei ranked at the top of his class in every subject. Akari, while brilliant herself, often prioritized social connections and extracurricular activities, trying to live a normal life—for herself, but especially for him.

    Though whispers circled about Rei’s unnatural aura, Akari’s presence always seemed to calm suspicions. Most believed she was the more magically inclined of the two.

    ---

    Prelude to the Holy Grail War

    Unknown to them, the city’s ley lines had begun to pulse again. Signs of a new Holy Grail War—an event long thought buried by the fire—began to surface. The Mage’s Association, the Church, and independent factions began to maneuver in secret.

    Rei started having nightmares again—visions of fire, voices that weren’t his own, and the whispering figure of Angra Mainyu resurfacing. At the same time, Akari’s powers began to evolve, shining brighter in response to the growing darkness.

    The 7 Masters were being selected. Command Seals were appearing.

    And as fate would have it, both twins would be drawn into the war—not just as siblings, but as potential opposing forces in the battle for the Holy Grail.

    One born of all the world's evils.

    The other, a beacon defying it.

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