Fomortiis

Fomortiis is a giant horned demon known as the Demon King and is the true main antagonist, as well as the final boss, of Fire Emblem: The Sacred Stones.

Profile: In the year 3, the Five Heroes trapped the Demon King's soul using the Sacred Stones. One of the stones, the Stone of Grado, housed his soul. Seething with his burning hatred, the stone became known as the Fire Emblem. In the year 803, the Emperor of Grado, Vigarde passes away. Out of grief, his son Prince Lyon attempts to revive him using the power of the Sacred Stone of Grado. The attempt is successful, but causes the Sacred Stone housing Fomortiis' soul to split in half and the stone changes Lyon. Depending which of the Renais royal twins the player decides to follow for the story, the Demon King's influence on him changes as stated below.

Regardless of the route the player picks, after Lyon's death, Fomortiis manages to resurrect himself. He fights Ephraim, Eirika and their allies, but is unable to withstand their assault. Defeated, the two seal his soul in Sacred Stone of Rausten, before destroying his body to ensure that he will never be resurrected again.

Ephraim's route Fomortiis does not take possession of Lyon's body, instead merely manipulating his darkest thoughts and emotions in order to make the prince himself work for his benefit. While Lyon acts on his own free will, he is unwittingly full of the emotions and fears chosen by Fomortiis to take over his mind, and is thus both manipulated and corrupted by the Demon King.

Upon Lyon's death, Fomortiis decides to take a different approach, attacking his enemies directly.

Eirika's route Fomortiis takes direct control of Lyon's body after being released from the Sacred Stone of Grado, and both possesses and mind controls the young Prince of Grado to do his bidding. Lyon is thus forced to perform every task that the Demon King chooses for him in order to destroy the remaining Sacred Stones, to ensure Fomortiis' revival.

Conspiracy to destroy the Sacred Stones Free of his prison in either route, Fomortiis begins his reign of terror once more and invades Magvel, starting with Renais seeking to destroy its Sacred Stone using Vigarde and Lyon as his puppets. When he fails to locate the stone and the means to destroy it, he moves on to Frelia, where his generals Selena and Caellach easily overpower the Frelians and destroy their Sacred Stone.

Fomortiis then sends Caellach to Jehanna, where he kills Queen Ismaire and destroys the stone. Afterwards, both generals Caellach and Valter are slain by Eirika and Ephraim in Jehanna's desert. Angered, Fomortiis (still possessing Lyon) goes to stop the twins himself and destroy the stone they possess; he fails and retreats.

Fomortiis then tricks Eirika into handing him over the stone of Renais by posing as Lyon and the stone is destroyed. The twins venture to Rausten while Fomortiis travels to his temple in Darkling Woods to revive his body. Fomortiis then sends his last remaining general, Riev, to destroy the stone of Rausten and kill the Divine Emperor Mansel. Riev fails and retreats into Darkling Woods, where he is eventually slain and the twins gain entrance into the Black Temple of the Demon King.

Personality: Fomortiis is a highly ominous demonic being in control of Lyon. Depending on the route, glimpses of his grip on the young prince appear in; he has far less control over Lyon in Ephraim's route, choosing to manipulate his thoughts and only appearing as a last resort, whereas in Eirika's route, he is far more direct in his control and has consumed Lyon's psyche. In both cases, Fomortiis twists Lyon's feelings towards the twins; Fueling jealousy towards Ephraim for his strength and gallant nature and corrupting his love for Eirika into almost a lustful desire to make her his.

Heroes fleshes him further as an incarnation of pure evil who simply wishes to control worlds with his power. He makes offers of power and wish fulfillment such as the reincarnation of a loved one for Kiran should they ally. While still possessing Lyon's body when on standby, he has no attachment to his host, expressing a desire to overtake an Askran noble or Kiran themselves.

General Appearance

A massive, demon-like dragon creature with a heavily muscular humanoid upper body and a long, powerful reptilian tail.

Its overall build is extremely bulky and imposing, with exaggerated shoulders, thick arms, and a broad chest.

The creature’s skin is a dark purple-black, with glowing orange magma-like cracks running across its body, especially along the chest, abdomen, arms, and legs.

Purple, smoky energy or aura crackles around parts of its body.

Head & Face

The head is draconic and armored, with a sharp, predatory grin full of jagged teeth.

Its eyes glow with a menacing reddish-orange light.

A bright glowing core or gem-like structure sits in the center of its forehead.

The creature has large, curved horns extending outward and upward from its head, giving it a crown-like silhouette.

Torso & Chest

The chest is broad and heavily muscled, with glowing orange fissures forming a pattern down the center.

The abdomen is segmented like a reptile’s underbelly, transitioning into the tail.

The glowing cracks resemble molten lava beneath the skin, emphasizing its demonic power.

Arms & Claws

Its arms are massive and heavily muscled, ending in large clawed hands.

The claws are long, sharp, and metallic-looking, suitable for tearing or crushing.

The forearms and shoulders have dark armored plating with glowing cracks similar to the rest of the body.

Wings

Large bat-like wings extend from its back.

The wings are dark purple with veiny membranes and glowing highlights, making them appear powerful and intimidating.

Lower Body & Tail

The legs are thick and powerful, digitigrade like a dragon or large reptile.

The feet end in large talons capable of gripping or crushing stone.

A long segmented tail extends behind it, thick near the base and tapering toward the end, with a lighter orange underbelly.

He's also massive, like a giant compared to an average person.