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“Now, humans... Lament your fate. Weep for the dead. Despair for the living. Wail and tremble in grief. Grovel in awe and fear. I am returned.”
—Fomortiis in the Erika's Endgame Route.

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.


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.


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.


Help Description: The Demon King, lord of darkness. His sole desire is to remake the world.

The Sacred Stones[]



Secret Book (Artwork)
Subjective: The following part of this article is based upon the editor's personal experiences and opinions, and therefore may not be applicable for all readers.

Fomortiis will be a doubtlessly difficult enemy, even if you trained all your units constantly with monster encounters. His Demon Light is extremely powerful and possesses the range up to a Longbow. He also uses Ravager, which is an uppercut jab which can deal very high damage and even kill weakened targets. Both Demon Light and Ravager also provide Fomortiis with stat boosts which make it even harder to get high damage through.

Fomortiis also has access to Nightmare, which, despite having a hit chance of 70, will send every player unit in its range to Sleep for five turns without fail. Restore can work but considering that it hits multiple units if they are within range, Latona is the only way to counter it. In addition, Fomortiis can occasionally summon 8 monsters (Wights, Entombeds, Deathgoyles, Arch Mogalls, Gorgons, Elder Baels, Maelduins, Cyclops, Gwyllgis and Draco Zombies) to assist him in battle.

The easiest way to defeat Fomortiis, generally, is to simply rush in and attempt to kill him as quickly as possible. He will always spend his first turn on summoning, effectively giving you two turns of attack on him if you can get your troops in range on the first turn (possibly through Warp, Rescue, or Tethys' dance). In particular, Eirika and Ephraim both start close enough to charge him on the first turn. While Fomortiis does hit very hard, he should not be in active danger of one-rounding your units if they have been trained, due to his Speed being one of his lower stats. Sacred Twin weapons deal fairly hefty damage to him, as does the Dragonstone and a Bishop with Aura. A Triangle Attack with Vidofnir or Audhulma can knock off a large chunk of his health, as can an activation of Pierce. Two full rounds of attacks from these various methods should be enough to put him down.

Unlike most other endgame bosses which are incapable of moving, Fomortiis can and will move to attack targets in his range. Players should be careful not to get a weak unit nearby or he will kill them quickly.

Fire Emblem Heroes[]

Demon King
Prince Lyon of Grado, having become a vessel for the Demon King Fomortiis's power. It is uncertain who directs his heart. Appears in Fire Emblem: The Sacred Stones.

Base Stats[]

Rarity: ✯✯✯✯✯

Lyon Demon King Heroes spriteTitle
Demon King
Heroes Infantry Infantry
FEH skill offense Blood Tome
FEH skill special Daylight
FEH Wind Tome Tome


FEH skill offenseWind---
Elwind-FEH Star Rarity 3-
RexcaliburElwindFEH Star Rarity 4FEH Star Rarity 3
Blood TomeRexcaliburFEH Star Rarity 5FEH Star Rarity 5
FEH skill specialDaylight--FEH Star Rarity 5
SolDaylight-FEH Star Rarity 5
AFEH Bonus Doubler 1 Bonus Doubler 1--
FEH Bonus Doubler 2 Bonus Doubler 2FEH Bonus Doubler 1 Bonus Doubler 1-
FEH Bonus Doubler 3 Bonus Doubler 3FEH Bonus Doubler 2 Bonus Doubler 2FEH Star Rarity 5
BFEH Null C-Disrupt 1 Null C-Disrupt 1--
FEH Null C-Disrupt 2 Null C-Disrupt 2FEH Null C-Disrupt 1 Null C-Disrupt 1-
FEH Null C-Disrupt 3 Null C-Disrupt 3FEH Null C-Disrupt 2 Null C-Disrupt 2FEH Star Rarity 5
CFEH Rouse Atk Res 1 Rouse Atk/Res 1--
FEH Rouse Atk Res 2 Rouse Atk/Res 2FEH Rouse Atk Res 1 Rouse Atk/Res 1-
FEH Rouse Atk Res 3 Rouse Atk/Res 3FEH Rouse Atk Res 2 Rouse Atk/Res 2FEH Star Rarity 5


Secret Book (Artwork)
Subjective: The following part of this article is based upon the editor's personal experiences and opinions, and therefore may not be applicable for all readers.
Base Set[]

Being possessed by the Demon King Fomortiis has granted Lyon an immense level of power for his Fallen form. He is more or less the same as his base form in terms of stats, having even higher Atk at neutral 40 without his tome and good mixed bulk, but at the cost of even less Spd. While his stats scream defensive bulky unit, there is more to him that makes him even more dangerous thanks to his tome and access to certain skills.,

His Blood Tome grants him an additional +3 Atk on top of the tomes base 14 Mt, thus granting him a neutral Atk of 53. Much like his base form, he is a baiting mage with a focus on ranged units in general as the tome reduces the effect of Area of Effect specials by 80%, thus stifling mages like Ophelia or Lilina on top of further reducing damage inflicted by ranged units by 50%. Finally, it has a Raventome effect, inflicting a color advantage over colorless units. He can easily take hits from Legendary Alm, Brave Veronica, Brave Lyn, and all armored archers with ease as they all deal significantly reduced damage. All-in-All, Fallen Lyon is the perfect end-all, do-all ranged unit counter in the game.

Sol gives him 50% of the damage he inflicts on his opponent back to him as health recovered. Bonus Doubler doubles the visible buffs he receives, making him even bulkier and hard hitting as a result. Null C-Disrupt shuts down problematic Dazzling Staff units like Bridal Fjorm and ranged Windsweep units from trying to poke him out. Rouse Attack Resistance grants him +6 Atk/Res at the start of his turn if he is not adjacent to an ally, thus he can be a frontline tank to bait out problematic ranged units and maintain his two strongest stats.


Though his bulk is solid on both fronts, Fallen Lyon's physical bulk is slightly lower. Unfortunately, most of his effect benefits come from combating ranged units, thus close quarters units negate a majority of the effects of his tome, leaving him with just his three passives as a result. Red sword units can easily dish out strong damage against him, especially since a majority of sword units in the game have enough Spd to exploit his low neutral 16 Spd and double attack him.

Skill Inheritance[]

Noontime is a slightly faster charging version of Sol with a slightly weaker effect. Nonetheless, it helps consistently keep Fallen Lyon's regeneration going strong. Reposition or Draw Back are solid positioning Support skills for him. Sturdy Stance maximizes his enemy turn power as it is where he is at his most powerful. Fortress Defense Resistance also works fantastically as his Atk is merely reduced to a neutral 51, which is still quite powerful, on top of bringing both of his bulk stats to around 40, making him an imposing wall. Lull Attack Resistance further punishes enemies who try to attack him by negating their visible buffs to Atk/Res and inflicting -3 to their stats as well. Skill C is flexible enough to run Smoke skills like Attack Smoke, otherwise the skill slot is up to the player in terms of his synergy with the rest of his team.

Meet Some of the Heroes[]

Demon King Lyon
Lyon demon king pop01 The empire of Grado rules the south of the continent of Magvel, and the heir to the imperial throne, Lyon, was known as a kind and gentle prince… So what's this wicked aura that's surrounding him?!
Lyon demon king pop02 There's no doubt about it—that dark energy is just like that of the Demon King who once threatened to conquer all of Magvel!
Lyon demon king pop03 Lyon must have been possessed by the Demon King while he was carrying out his research… But why did he get himself involved in something so dangerous in the first place?
Lyon demon king pop04 With his body fully under the Demon King's control, there isn't even a hint of the old Lyon anymore. But I'm sure his gentle soul must be sleeping in there somewhere!
Closely Associated Characters
Ephraim Prince of Renais. Eirika's twin. Cares deeply for his sister. His confidence has sometimes put him in danger. Lyon's friend.
Eirika Princess of Renais. Ephraim's twin. Cares dearly for her brother. Her kindness has sometimes put her in danger. Lyon's friend.

Demon King
The Demon King who once threatened all of Magvel before being defeated by five heroes and sealed in the Sacred Stones. Appears in Fire Emblem: The Sacred Stones.

Base Stats[]

Rarity: ✯✯✯✯✯

Fomortiis Heroes spriteTitle
Demon King
Heroes Armored Armored
FEH skill offense Ravager
FEH skill special Glowing Ember
FEH Colorless Beast Beast


FEH skill offenseWhelp (Armored)---
Yearling (Armored)---
Adult (Armored)---
Ravager-FEH Star Rarity 5-
FEH skill specialGlowing Ember---
BonfireGlowing Ember--
AFEH Nightmare Nightmare-FEH Star Rarity 5
BFEH Beast Follow-Up 1 Beast Follow-Up 1--
FEH Beast Follow-Up 2 Beast Follow-Up 2FEH Beast Follow-Up 1 Beast Follow-Up 1-
FEH Beast Follow-Up 3 Beast Follow-Up 3FEH Beast Follow-Up 2 Beast Follow-Up 2FEH Star Rarity 5
CFEH A D Far Save 1 A/D Far Save 1--
FEH A D Far Save 2 A/D Far Save 2FEH A D Far Save 1 A/D Far Save 1-
FEH A D Far Save 3 A/D Far Save 3FEH A D Far Save 2 A/D Far Save 2-


Secret Book (Artwork)
Subjective: The following part of this article is based upon the editor's personal experiences and opinions, and therefore may not be applicable for all readers.
Base Set[]

Fomortiis is a Colorless Beast Armor Mythic Hero who lives up to his Demon King moniker. Blessed as an Anima Season unit, he is built for Aether Raids defense. Aside from his low 15 neutral Spd, the rest of his stats pack immense power from his 44 Atk to his mixed bulk scores of 92 physical and 90 magical. With his powerful kit in tow, Fomortiis is an absolute powerhouse that causes heavy damage and disruption to those who face him improperly. As the winner of the A Hero Rises 2023 event, every player was given a free copy of him, thus making him accessible and ever present in PVP modes.
Ravager is Fomortiis' unique beast weapon that allows him to transform only when he is alone or next to a beast/dragon ally, or at least without taking the rest of his kit into consideration. That aside, it has a special countdown reduction. If he has at least 25% of his maximum HP at the start of combat when his foe initiates combat, he increases his foes' special counter countdown and reduces the damage from their follow-up attack by 80%. Once transformed, his special charges faster per attack and he can counterattack against ranged foes.
Fomortiis' Mythic Skill A is Nightmare which inflicts Atk/Def-10 on his foe and reduces damage of the first attack by 30% if the foe initiates combat on him while his health is at least 75% at the start of combat. After combat where his foe initiated combat and he survived, the closest foes within four spaces of that foe automatically ends their turn, which can shut down aggressive teams and thus open opportunities for his allies to exploit potentially vulnerable targets due to improper turn management.
Bonfire adds 23 true damage to Fomortiis attacks due to his massive 46 Def. Beast Follow-Up removes the transformation conditions and gives him a guaranteed follow-up attack. Attack Defense Far Save allows Fomortiis to intercept any ranged attack against an ally who is adjacent to him and increases his Atk/Def by 1.


Fomortiis and his high durability is difficult to destroy outright as even Legendary Male Byleth cannot take him down in a single round of combat without assistance of other units/skills. He is exceptionally powerful during his opponent's phase but loses out on a vast majority of his skills if he is the one initiating combat thus baiting him into high Def units removes his big damage reduction on the second attack he receives. His slow Spd also means that Null Follow-Up or weapons/skills with that effect severely hamper his damage output, though units without significant bulk or damage only delays the inevitable. Depending on seals, Fomortiis can lose some units who are capable of either hard walling him like Rearmed Alfred or Rearmed Robin or have the ability to duel or outright kill him such as Fallen Edelgard and Harmonic Edelgard respectively. Some hyper offense units like Legendary Alm, both Legendary Byleth's, and Legendary Shez carry enough offensive pressure to make his damage reductions moot, especially if carrying Windsweep effects.

Skill Inheritance Options[]

Fomortiis only empty skill is his Assist Skill, which Pivot or Swap work well to increase his movement or to put him in better positions to make use of his defensive skills.

Meet Some of the Heroes[]

Demon King Fomortiis
Fomortiis demon king pop01 Fomortiis, the Demon King, once cast a long shadow over the continent of Magvel. He led armies of monsters against mankind in a brutal conflict.
Fomortiis demon king pop02 At the end of that long and violent war, Fomortiis was defeated by a group of Heroes, and his soul was separated from his body and sealed away.
Fomortiis demon king pop03 Eight hundred years later, however, his will was somehow freed from its imprisonment—and corrupted the mind of Lyon, prince of the empire of Grado!
Fomortiis demon king pop04 Having assumed the guise of Lyon, Fomortiis led Grado on an aggressive campaign to break the seals that bound him—at which point, the Demon King would be truly reborn!
Closely Associated Characters
Lyon Prince of Grado; not fond of fighting. A childhood friend of Ephraim and Eirika. Fomortiis takes control over his mind.
Myrrh A manakete who is much older than her appearance suggests. She's shy but oddly attached to Ephraim. A survivor of the manaketes' battle against Fomortiis long ago.



“You miserable fools...”
—Fomortiis' defeat quote


Fomortiis/Heroes Quotes

Non-Canon Appearances[]

Fire Emblem 0 (Cipher)[]

Fomortiis is illustrated in the trading card game Fire Emblem Cipher with the following cards:


In Irish mythology, the Fomoiri or Fomorians were a group of sea demons comparable to the Titans of Greek myth. While they were normally terrible and vicious, Ethniu, daughter of Fomoiri leader Balor, married the hero Cian and bore him the son Lugh. His name may also be a wordplay, as his Japanese name is "Fodeath" and mortiis is a variation of the Latin word for death.


  • Fomortiis has a very unique death animation. Instead of vanishing (as when a unit is being killed), his body slowly disappears, starting with his arms and what should be his legs to his face.
  • Fomortiis is one of the several final bosses in the series to move. The others are Idunn, Duma, Ashnard (Only in Hard Mode), Garon and Nemesis.
  • Fomortiis is one of only three bosses in The Sacred Stones who does not have a battle quote nor death quote, the other being Morva and the Deathgoyle from Chapter 11 of Ephraim's route.
  • Fomortiis is never referenced by name in dialogue, only being referenced as Demon King. His name is only used for his in-game unit name.
    • Still, in Heroes, the Original Lyon refers to him as Fomortiis in the Support Conversations during the Forging Bonds event.
  • Prior to his formal debut in Heroes, Fomortiis was a playable character while possessing Lyon (The Sacred Stones' central antagonist).
    • His ethereal form is summoned as part of Blood Tome, Fallen Lyon's personal weapon. Blood Tome's animation is similar to Fomortiis' attack animation with Ravager in the Sacred Stones.
  • Fomortiis and the Dragon are the only two mainline final bosses not eligible for the Choose Your Legends voting competition.
  • In Rogues & Redeemers 2, Lyon attempts to coerce Priam with promises of limitless power. He explains that he only needs Priam to meet a "friend of his", referring to Fomortiis, before Priam turns him down, sensing that something about Lyon's offer was amiss.
  • Fomortiis is the first Beast unit in Heroes whose art illustrates their transformed form rather than their humanoid or vessel form.


See main article: Fomortiis/Gallery.