Fomortiis Builds and Best IVs

This is a ranking page for the hero Fomortiis - Demon King from the game Fire Emblem Heroes (FEH). Read on to learn the best IVs (Individual Values), best builds (Inherit Skill), weapon refinement, stats at Lv 40, and more for Fomortiis.

Mythic Heroes - Double Mythic Heroes (Gullveig & Kvasir) Featured Heroes
Legendary Yuri [9.5/10]	Fallen Byleth (F) [9.5/10]	Kvasir [9.0/10]	Legendary Caeda [9.0/10]
Nerþuz [9.0/10]	Eitr [9.0/10]	Seiðr [9.5/10]	Legendary Robin (M) [9.5/10]
Heiðr [9.0/10]	Fomortiis [9.5/10]	Legendary Guinivere [9.5/10]	Gullveig [9.5/10]

Fomortiis Rating and Basic Information

Overall Rating	9.5/10
Reroll Ranking (excluding Inherit Skill)	S (▶Reroll Ranking)
Ranking (including Inherit Skill)	S (▶FEH Tier List)

Fomortiis - Demon King: Basic Information

Color / Weapon Type / Move Type	Colorless / Colorless Beast / Armored
Rarity	5 Star
What Kind of Character Are They?	・Weapon skill inflicts Atk/Def-6 and Special deceleration on foe, grants Special acceleration and damage reduction on follow-up attacks to unit, and allows counterattacks at any range. ・Exclusive A skill inflicts Atk/Def-10 on foe, grants damage reduction on first attack, and ends the action of foe's allies after combat.

Fomortiis Skills at 5★

Ravager Might: 14　 Range: 1 Accelerates Special trigger (cooldown count-1). At start of combat, if unit's HP ≥ 25%, inflicts Special cooldown charge -1 per attack on foe and Atk/Def-6 on foe during combat (only highest value applied; does not stack), and also, if unit is transformed, grants Special cooldown charge +1 per attack to unit during combat (only highest value applied; does not stack). If unit's HP ≥ 25% at start of combat and foe initiates combat, reduces damage from foe's follow-up attack by 80% during combat. At start of turn, if unit is adjacent to only beast or dragon allies or if unit is not adjacent to any ally, unit transforms (otherwise, unit reverts). If unit transforms, grants Atk+2, and if foe initiates combat, unit can counterattack regardless of foe's range.

Bonfire Cooldown Count = 3 Boosts damage dealt by 50% of unit’s Def.

Nightmare If foe initiates combat or foe's HP ≥ 75% at start of combat, inflicts Atk/Def-10 on foe during combat and reduces damage from foe's first attack during combat by 30%. If foe initiates combat, after combat, the closest foes within 4 spaces of target who have yet to act have their actions end immediately.

Beast Follow-Up 3 Removes the condition to transform. Unit makes a guaranteed follow-up attack during combat.

A/D Far Save 3 If a foe uses bow, dagger, magic, or staff and initiates combat against an ally with 2 spaces of unit, triggers【Savior】on unit. If unit triggers Savior, grants Atk/Def+4 during combat. 【Savior】 Unit takes ally’s space, enters combat in ally’s place, and receives all after-combat effects. Doesn't trigger if ally is on terrain that unit can't move to or if multiple units are able to use Savior during the same combat. If Savior triggers, after-combat movement effects don't occur.

Fomortiis Best IVs

Recommended IVs

Stat	Superboon/Superbane	IV Recommendation
HP (22)		★★★★☆
Atk (14)		★★★★★
Spd (5)		★☆☆☆☆
Def (9)		★★★★★
Res (9)		★★★★☆

◯ = Stat gains +4 with a superboon, ✕= Stat goes down by -4 with a superbane, - = No assets or flaws

See the IV Checker for All Units

Trait Fruits—How to Change IVs

When using an Ascendant Floret, we recommend getting the next superboon if it fits the hero. If not, consider what stat your hero needs most.

+Atk / -Spd

The best IVs for Fomortiis are +Atk and -Spd. Atk is a superboon and boosting it improves his combat performance, allowing him to potentially knock out his foes.

His Spd is a clear dump stat and he will be outsped by a large majority of the cast. Thus, it is the bane of choice.

+Atk for a +10 merge

We recommend +Atk when merging Fomortiis to +10 in order to improve his damage output. If optimizing for bulk, +Def is also a good choice.

Fomortiis Best Builds

Near Save Fomortiis

HOT
： Ravager ： Swap ： Pavise ： -	： Nightmare ： Hardy Fighter 3 ： D/R Near Save 3 ： Steady Breath ： -

How to Use, Explanation

This Near Save build aims to protect the team against melee threats through Savior. Transformation isn't necessary for a Near Save build, thus, Hardy Fighter is used to reduce incoming damage. Steady Breath provides Special acceleration that is missing when untransformed. If using a beast/dragon team, you may replace this with a stat boosting Seal.

Far Save / Budget Fomortiis

HOT
： Ravager ： Swap ： Bonfire ： -	： Nightmare ： Beast Follow-Up 3 ： A/D Far Save 3 ： Atk/Def Form 3 ： -

How to Use, Explanation

Fomortiss comes with a pretty good base kit for a Far Save role. Simply add an assist and a stat boosting Sacred Seal and he's good to go.

Source Heroes for All Skills

Fomortiis Stats

Stat Rankings

Neutral Stats at Lv. 40 (5★)
195
HP	46	Rank: 59/1088
Atk	44	Rank: 42/1088
Spd	15	Rank: 976/1088
Def	46	Rank: 4/1088
Res	44	Rank: 8/1088

Stat Values

Lv 40+10 Stats (5★)

	HP	Atk	Spd	Def	Res	Total
+10 Merges W/ Skill Bonuses	51	63	19	51	48	232
Lv.40 +10	51	49	19	51	48	218

Stats at Lv 40

	HP	Atk	Spd	Def	Res	Total
5★- Adjusted for Skills	46	58	15	46	44	209
5★ Lv.40	46	44	15	46	44	195

Initial Stats (with Skills)

	HP	Atk	Spd	Def	Res	Total
5★ Lv.1	22	28	5	9	9	73

Stat Comparison of Similar Heroes

Hero	HP	Atk	Spd	Def	Res	Total
Fomortiis	46	44	15	46	44	195
Fallen Edelgard	45	42	14	44	39	184
Caineghis	47	37	23	37	30	174

Note: Stats bonuses from skills are not taken into account.

Fomortiis Roles, Strengths, and Weaknesses

Fomortiis Roles

Fomortiis - Demon King Roles
Close-Physical	Ranged-Physical	Close-Magic	Ranged-Magic
Physical Wall	Magic Wall	Effective Weapon	Movement Assist
Exclusive Skill	All-Range Counter	Recovery	Refresher
Legendary	Mythic	Duo / Harmonized	Resplendent

Fomortiis is a close physical attacker (range = 1). Therefore, when not accounting for the Weapon Triangle, the amount of damage he deals will be equivalent to his Atk minus the foe's Def stat.

Fomortiis Strengths

Ravager has multiple in-combat effects

Fomortiis comes with his exclusive weapon Ravager. It inflicts Special cooldown charge -1 per attack and Atk/Def-6 on foe during combat, and grants 80% damage reduction on foe's follow-up attacks.

It has the standard beast transformation conditions, and Fomortiis gains Atk+2, Special cooldown charge +1 per attack, and a Distant Counter effect when he is transformed. Formortiis also comes with Beast Follow-Up 3 which allows him to ignore transformation conditions, allowing him to be at peak performance.

Nightmare inflicts massive Atk/Def penalties, grants damage reduction, and forcefully ends foe's turns

Fomortiis also has an exclusive A skill in Nightmare. This skill inflicts Atk/Def-10 on his foe during combat and reduces damage from his foe's first attack by 30%.

More importantly, after combat, Nightmare ends the turn of the closest foes within 4 spaces of the foe who attacked him. This is an amazing effect which indirectly improves his survival by receiving less attacks, and the 4 space condition makes it a difficult skill to play around. Galeforce teams will require careful positioning in order to avoid this effect.

Armored Defense Mythic

Fomortiis' status as an Armored Defense Mythic hero allows him to fulfill the Savior role without taking up a valuable non-Mythic hero slot in Aether Raids Defense team compositions. He can equip Savior skills and protect the team from powerful initiators, while the rest of his team can be fully geared towards offensive performance.

While Duma is another Armored Defense Mythic, his C slot is occupied by Upheaval+, which is the primary reason to field Duma. Fomortiis doesn't have an exclusive skill in his C slot, allowing him to equip Savior skills while fulfilling his non-Savior role.

His overall bulk is impressive, with base 46 HP, 46 Def, and 44 Res. As of the time of his release, his base 46 Def is the highest in the entire game, and his base 44 Res is the second highest. He will need these stats in order to fulfill his role, as he will not receive Mythic blessing bonuses due to being a Mythic hero himself.

Fomortiis Weaknesses

Weak to Armor Effective Weapons

Fomortiis takes 1.5x damage from armor-effective weapons like Slaying Hammer+, Randgríðr, or Thani, and one blow from this type of weapon will deal significant damage. Make sure you know what weapons you are up against before hopping too far into the line of battle!

Weak to Beast Effective Weapons

Fomortiis takes 1.5x damage from beast-effective weapons like Brave Eliwood's Nini's Ice Lance or Picnic Flora's Sæhrímnir, and one blow from this type of weapon will deal significant damage. Make sure you know what weapons you are up against before hopping too far into the line of battle!

Heroes with Effective Skills

Should you Unlock Potential?

Should You Unlock Potential for this Hero?	Cannot Unlock Potential

Fomortiis - Demon King Only Appears as a 5 Star Hero!

Fomortiis - Demon King only appears as a 5 Star Hero. We will include whether or not you should Unlock Potential for Fomortiis - Demon King if a 4 Star version is released!

Unlock Potential Tier List

Fomortiis - List of Skills

Weapons

Skill Name	Might	Range	Effect	Learned At
Whelp (Armored)	4	1	At start of turn, if unit is adjacent to only beast or dragon allies or if unit is not adjacent to any ally, unit transforms (otherwise, unit reverts). If unit transforms, grants Atk+2, and unit can counterattack regardless of foe's range.	5★
Yearling (Armored)	6	1	At start of turn, if unit is adjacent to only beast or dragon allies or if unit is not adjacent to any ally, unit transforms (otherwise, unit reverts). If unit transforms, grants Atk+2, and unit can counterattack regardless of foe's range.	5★
Adult (Armored)	9	1	At start of turn, if unit is adjacent to only beast or dragon allies or if unit is not adjacent to any ally, unit transforms (otherwise, unit reverts). If unit transforms, grants Atk+2, and unit can counterattack regardless of foe's range.	5★
Ravager	14	1	Accelerates Special trigger (cooldown count-1). At start of combat, if unit's HP ≥ 25%, inflicts Special cooldown charge -1 per attack on foe and Atk/Def-6 on foe during combat (only highest value applied; does not stack), and also, if unit is transformed, grants Special cooldown charge +1 per attack to unit during combat (only highest value applied; does not stack). If unit's HP ≥ 25% at start of combat and foe initiates combat, reduces damage from foe's follow-up attack by 80% during combat. At start of turn, if unit is adjacent to only beast or dragon allies or if unit is not adjacent to any ally, unit transforms (otherwise, unit reverts). If unit transforms, grants Atk+2, and if foe initiates combat, unit can counterattack regardless of foe's range.	5★

Assists

This Hero has no Assist skills that can be learned.

Specials

Skill Name	Effect	Learned At
Glowing Ember	(Cooldown Count = 4) Boosts damage dealt by 50% of unit’s Def.	5★
Bonfire	(Cooldown Count = 3) Boosts damage dealt by 50% of unit’s Def.	5★

Passives

Skill Name	Effect	Learned At
Nightmare	If foe initiates combat or foe's HP ≥ 75% at start of combat, inflicts Atk/Def-10 on foe during combat and reduces damage from foe's first attack during combat by 30%. If foe initiates combat, after combat, the closest foes within 4 spaces of target who have yet to act have their actions end immediately.	5★
Beast Follow-Up 1	If unit's HP = 100%, removes the condition to transform. At start of combat, if unit's HP = 100%, unit makes a guaranteed follow-up attack during combat.	5★
Beast Follow-Up 2	If unit's HP ≥ 50%, removes the condition to transform. At start of combat, if unit's HP ≥ 50%, unit makes a guaranteed follow-up attack during combat.	5★
Beast Follow-Up 3	Removes the condition to transform. Unit makes a guaranteed follow-up attack during combat.	5★
A/D Far Save 1	If a foe uses bow, dagger, magic, or staff and initiates combat against an ally adjacent to unit, triggers【Savior】on unit. If unit triggers Savior, grants Atk/Def+1 during combat. 【Savior】 Unit takes ally’s space, enters combat in ally’s place, and receives all after-combat effects. Doesn't trigger if ally is on terrain that unit can't move to or if multiple units are able to use Savior during the same combat. If Savior triggers, after-combat movement effects don't occur.	5★
A/D Far Save 2	If a foe uses bow, dagger, magic, or staff and initiates combat against an ally with 2 spaces of unit, triggers【Savior】on unit. If unit triggers Savior, grants Atk/Def+2 during combat. 【Savior】 Unit takes ally’s space, enters combat in ally’s place, and receives all after-combat effects. Doesn't trigger if ally is on terrain that unit can't move to or if multiple units are able to use Savior during the same combat. If Savior triggers, after-combat movement effects don't occur.	5★
A/D Far Save 3	If a foe uses bow, dagger, magic, or staff and initiates combat against an ally with 2 spaces of unit, triggers【Savior】on unit. If unit triggers Savior, grants Atk/Def+4 during combat. 【Savior】 Unit takes ally’s space, enters combat in ally’s place, and receives all after-combat effects. Doesn't trigger if ally is on terrain that unit can't move to or if multiple units are able to use Savior during the same combat. If Savior triggers, after-combat movement effects don't occur.	5★

Fomortiis as a Source Hero

Value of Skills	★★★★★

Fomortiis has Beast Follow-Up 3 and A/D Far Save 3 as inheritance options.

Beast Follow-Up 3 is the skill of choice to inherit when using Fomortiis as fodder. However, we recommend you keep at least one copy in your barracks, as he is a powerful hero.

List of Source Heroes

The Best Fodder Units

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How to Get Fomortiis / Illustrations / Voice Actor / Quotes

How to Get Fomortiis

Obtained through a Special Summoning Event!

Fomortiis is a limited time Hero who can be pulled from a Mythic Hero Summoning event. They do not appear in regular summons.

Note: Not currently a featured hero in any Summon events.

Voice Actor and Illustrator Information

Voice Actor (English)	Mark P. Whitten
Illustrator	Daisuke Izuka
Appears In	Fire Emblem: The Sacred Stones

Illustration

FEH: Related Guides

Mythic Heroes - Double Mythic Heroes (Gullveig & Kvasir)

Heroes from Mythic Heroes - Double Mythic Heroes (Gullveig & Kvasir)
Legendary Yuri [9.5/10]	Fallen Byleth (F) [9.5/10]	Kvasir [9.0/10]	Legendary Caeda [9.0/10]
Nerþuz [9.0/10]	Eitr [9.0/10]	Seiðr [9.5/10]	Legendary Robin (M) [9.5/10]
Heiðr [9.0/10]	Fomortiis [9.5/10]	Legendary Guinivere [9.5/10]	Gullveig [9.5/10]

See All Colorless Heroes

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All Types of Colorless Weapons

Close-Range	Ranged
Colorless Breath	Colorless Dagger
Colorless Beast	Colorless Bow
Colorless Tome	Staff