Eir Builds and Best IVs

This is a ranking page for the hero Eir - Merciful Death 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 Eir.

Heroes With the Same Name
Eir	New Year Eir
Ascended Eir

Remix - Legendary & Mythic Hero Remix: Hríd & Eir Featured Heroes
Hríd [8.5/10]	Múspell [9.0/10]	Naga [8.5/10]	Nifl [9.0/10]
Legendary Hector [9.0/10]	Yune [9.5/10]	Eir [8.5/10]	Fallen Edelgard [9.0/10]

Eir Rating and Basic Information

Overall Rating	8.5/10
Reroll Ranking (excluding Inherit Skill)	A (▶Reroll Ranking)
Ranking (including Inherit Skill)	A (▶FEH Tier List)

Eir - Merciful Death: Basic Information

Color / Weapon Type / Move Type	Colorless / Dagger / Flying
Rarity	5 Star
What Kind of Character Are They?	・Mythic Hero with the Light effect ・Can prevent a foe's follow-up attack ・B Skill is very useful against dragons and staff users

Eir Skills at 5★

Lyfjaberg Might: 14　 Range: 2 Grants Res+3. At start of combat, if unit’s HP ≥ 50%, grants Atk/Spd+4 during combat, and if unit initiates combat, foe cannot make a follow-up attack. After combat, if unit attacked, inflicts Def/Res-7 on target and foes within 2 spaces of target through their next actions, and if bonus was granted to unit, deals 4 damage to unit.

Iceberg Cooldown Count = 3 Boosts damage dealt by 50% of unit’s Res.

Atk/Res Unity If unit is within 2 spaces of an ally, grants Atk/Res+5 and bonus to Atk/Res during combat = current penalty on each of those stats x 2 (Example: If unit has -7 penalty to Atk, grants Atk+19, for a net bonus of Atk+12.) Calculates each stat bonus independently.

Mystic Boost 3 Disables foe’s skills that "calculate damage using the lower of foe’s Def or Res" and "calculate damage from staff like other weapons." Restores 6 HP after combat.

Sparkling Boost+ At start of turn, restores 20 HP to ally that has been dealt the most damage. (Excludes unit.) At start of any ally's combat, if ally's HP≥ ≥ 50%, grants Res+5 to ally during combat. (Excludes unit.)

Eir Best IVs

Recommended IVs

Stat	Superboon/Superbane	IV Recommendation
HP (16)		★★☆☆☆
Atk (22)		★★★★★
Spd (9)		★★★★☆
Def (4)		★★★☆☆
Res (10)		★★☆☆☆

◯ = 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/-HP or Base Stats

Eir's best IVs are +Atk/-HP, although she will be held back by a flaw in pretty much any stat, so if you cannot merge her, base stats are also a good option. Since she has Lyfjaberg and Swift Sparrow, which will both give her a solid Spd boost in combat, +Atk will help maximize her damage. +Spd is also a good IV as it will further increase the amount of follow-up attacks she gets.

+Atk for a +10 Merge

If you are building a +10 merged Eir, we recommend +Atk. With +10 merges, Eir's base Spd will reach 41, and she will have other skills to help increase it even further, so it would be better to focus on increasing the damage output from each attack she deals. Since HP and Def are both superboons that will give her +4 to the stat, these are good +IV options for a +10 merge.

Eir Best Builds

Budget Eir

HOT
： Lyfjaberg ： Draw Back ： Iceberg ： -	： Swift Sparrow 2 ： Mystic Boost 3 ： Sparkling Boost+ ： Swift Sparrow 2 ： -

How to Use, Explanation

This is a budget build for Eir with minimal Skill Inheritance. Since Eir's kit is pretty much complete, you can give her Draw Back or Reposition and Swift Sparrow 2 as her Sacred Seal. You can also opt for Atk/Spd Solo 3.

Aether Raids (Eirforce) Eir

HOT
： Lyfjaberg ： Reposition ： Moonbow ： -	： Fury 4 ： Disarm Trap 3 ： Atk/Spd Rein 3 ： Fury 3 ： -

How to Use, Explanation

This is a build for Aether Raids. The purpose of this build is to use Eir as a Wings of Mercy 3 target. Have her defeat a unit to tick her HP down with Fury on both her A and seal slots.. A dancer can give her another action and tick her HP down even more due. This will get her within Wings of Mercy 3 range, which the rest of her allies are supposed to have so they can clean up the rest of the enemy team.

Aether Raids (Support) Eir

HOT
： Temari+ ： Smite ： Moonbow ： -	： Fort. Def/Res 3 ： Disarm Trap 3 ： Sparkling Boost+ ： Fortress Res 3 ： -

How to Use, Explanation

This is a build for Aether Raids. This makes Eir a support and utilizes her high Res to debuff enemies with Temari+. Disarm Trap allows Eir to safely test traps for the team and avoid a 50 damage AoE nuke.

Refined Lyfjaberg Eir

： Lyfjaberg ： Reposition ： Iceberg ： -

： Atk/Spd Catch 4 ： A/S Far Trace 3 ： Atk/Spd Rein 3 ： Blade Session 3 ： -

How to Use, Explanation

This is a purely offensive Eir build with offensive skills to eliminate enemies. A/S Far Trace provides mobility post-combat and a small debuff to the opponent's Atk and Spd; S/D Far Trace would be better once it is released.

Source Heroes for All Skills

Eir Best Weapon Refine

Exclusive Weapon Effect from Refining (Special Effect Type)
Lyfjaberg	SP: 400
Might: 14　Range: 2　HP: Grants Res+3. At start of combat, if unit's HP ≥ 25%, grants Atk/Spd/Def/Res+4 to unit during combat, and also, if unit initiates combat of it unit's Spd > foe's Spd, foe cannot make a follow-up attack and inflicts Special cooldown charge -1 on foe per attack. (Only highest value applied. Does not stack.) If unit is within 3 spaces of an ally, grants Atk/Spd/Def/Res+4 to unit during combat, grants bonus to unit's Atk/Res during combat = 20% of unit's HP at start of combat, and restores 7 HP to unit and allies within 2 spaces after combat. ：500　：200

We recommend the Special Effect Refine for Lyfjaberg

We recommend the Special Effect Refine for Lyfjaberg only if you are using an offensive Eir build.

Lyfjaberg's refine grants Atk/Spd/Def/Res+4 during combat, bonus to Atk/Res equal to 20% of her current HP, and restores 7 HP to herself and allies within 2 spaces after combat.

The refine does disqualify useful skills such as Atk/Spd Push 4 and Fury 4 from her A slot due to negative synergy with the refine. Instead, use Swift Sparrow 3 or Atk/Spd Catch 4 for her A slot.

If running a support Eir, you can safely ignore this refine and continue to run Res-refined Temari+.

Eir Stats

Stat Rankings

Neutral Stats at Lv. 40 (5★)
149
HP	35	Rank: 918/1089
Atk	32	Rank: 765/1089
Spd	37	Rank: 314/1089
Def	14	Rank: 973/1089
Res	31	Rank: 258/1089

Stat Values

Lv 40+10 Stats (5★)

	HP	Atk	Spd	Def	Res	Total
+10 Merges W/ Skill Bonuses	40	51	42	18	38	189
Lv.40 +10	40	37	42	18	35	172

Stats at Lv 40

	HP	Atk	Spd	Def	Res	Total
5★- Adjusted for Skills	35	46	37	14	34	166
5★ Lv.40	35	32	37	14	31	149

Initial Stats (with Skills)

	HP	Atk	Spd	Def	Res	Total
5★ Lv.1	16	22	9	4	10	61

Stat Comparison of Similar Heroes

Hero	HP	Atk	Spd	Def	Res	Total
Wind Tribe Claude	42	44	47	24	26	183
Spring Ashe	40	43	46	32	17	178
Flame Tribe Tana	39	39	42	26	32	178
Ninja Igrene	40	43	38	22	30	173
Thief Sothe	41	39	41	28	23	172
Summer Claude	41	38	42	25	26	172
Ninja Lyn	40	38	42	21	26	167
Petra	40	32	38	25	20	155
Spring Palla	38	37	34	17	29	155
Hostile Springs Camilla	38	33	35	17	28	151
Spring Kagero	36	35	34	18	27	150
Hostile Springs Hinoka	38	35	35	16	26	150
Eir	35	32	37	14	31	149

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

Eir Roles, Strengths, and Weaknesses

Eir Roles

Eir - Merciful Death 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

Eir is a ranged physical attacker (range = 2). Therefore, when not accounting for the Weapon Triangle, the amount of damage she deals will be equivalent to her Atk minus the foe's Def stat. She is also a Mythic Hero, who will help increase your ranking in Aether Raids.

Mythic Hero Effect can boost allies' HP and Res

Eff.	Atk+3	Spd+4	Def+5	Res+5

Eir is a Mythic Hero, and when summoned, you will receive an Light Blessing. During Light Season, allies who have been given an Light Blessing and appear together with Eir in batlle will receive a HP+5 and Res+5 bonus to their stats, increasing the party's overall power.

Eir Strengths

Exclusive Weapon buffs Atk/Spd while preventing a follow-up attack

Eir's exclusive weapn skill Lyfjaberg will give her Atk/Spd+4 and prevent an enemy follow-up attack when she initiates combat and has at least 50% HP.

When combined with her A skill Swift Sparrow, she will gain Atk/Spd+8, making it very easy to gain a powerful follow-up attack. Her weapon's ability to block follow-up attacks is also extremely useful for countering enemy skills like Quick Riposte.

Excellent for countering Dragons and Staff Attackers

Eir's B Skill Mystic Boost will nullify the common effect of dragonstones which calculate damage using the lower of foe’s Def or Res.

On top of this, she can nullify skills like Wrathful Staff 3 and Staves that have been refined to calculate damage like other weapons, so she is very good at countering both dragon and staff enemies.

What's more, this skill restores HP after combat. Taking too much damage will cancel out the effects of Lyfjaberg, so unless you have a reason to use another B skill, we highly recommend keeping this one equipped as is.

Can heal her allies from anywhere on the map

At the start of each turn, Eir's C skill Sparkling Boost+ will restore 20 HP to the ally who has taken the most damage.

Healing an ally who has been targeted by multiple foes can often be difficult or even risky, so having the ability to heal allies without even going near them provides a huge advantage.

Additionally, this skill also grants Res+5 to any ally on the map if their HP ≥ 50%. This effect works on any ally, no matter how far away they are from Eir.

Excellent at tanking magic attacks

With the bonus from Lyfjaberg included, Eir has a base Res of 34, which allows her to safely tank magic attacks.

Since she also has Mystic Boost, she can nullify skills that use the lower of Res and Def, meaning that she can usually tank attacks from dragon foes as well without fear of being OHKO'ed.

Eir Weaknesses

Extremely weak to physical attackers

While Eir has a good Res stat, her Def leaves a lot to be desired. She can easily be OHKO'd with one or two physical attacks.

Bows will also deal 1.5x damage to her and will almost always spell destruction, so make sure she does not go near the attack range of this type of foe.

Eir Team and Counters

Teammates for Eir

Hríd	Soiree Ishtar	Summer Camilla	Thrasir
Yune	Gunnthrá	Leanne	Fallen Tiki (Young)

Units with Movement Assists or Support Buffs

Since she is a flying unit, Eir will benefit from being paired with allies who have skills like Flier Formation or Air Orders, as she will be able to cover more distance and attack more foes.

Additionally, if an ally has Hone Fliers, Eir will be able to use this extra power to take down her foes more easily.

Units who can tank physical attacks

Eir has a poor Def stat, so she will need an ally who can tank physical attacks on her behalf.

Since Bows are her biggest weakness, a unit with Distant Counter who can tank attacks from archers and retaliate will be a huge asset to her team.

Units who are strong agains foes with penalties

Eir is a dagger unit, so if an ally can fight debuffed foes and gain some kind of advantage, the team will have even better synergy.

Hrid can gain a guaranteed follow-up attack on foes with an active penalty, and he has Distant Counter, so is an excellent teammate for Eir.

Eir Counters

Sword Reinhardt	Tibarn	Keaton	Legendary Lucina
Caineghis	Legendary Alm	Klein	Brave Lyn

Bow units and strong physical attackers

With her low Def, Eir struggles against physical attackers in general.

If a foe with a bow or Brave Weapon attacks Eir, she will almost certainly perish. While her high Res stat means she can deal with magic attackers, she could keep far away from physical attackers, and leave them to another ally.

Should you Unlock Potential?

Should You Unlock Potential for this Hero?	Cannot Unlock Potential

Eir - Merciful Death Only Appears as a 5 Star Hero!

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

Unlock Potential Tier List

Eir - List of Skills

Weapons

Skill Name	Might	Range	Effect	Learned At
Iron Dagger	3	2	After combat, inflicts Def/Res -3 on foe through its next action.	5★
Steel Dagger	5	2	After combat, inflicts Def/Res -3 on foe through its next action.	5★
Silver Dagger	7	2	After combat, inflicts Def/Res -5 on foe through its next action.	5★
Lyfjaberg	14	2	Grants Res+3. At start of combat, if unit’s HP ≥ 50%, grants Atk/Spd+4 during combat, and if unit initiates combat, foe cannot make a follow-up attack. After combat, if unit attacked, inflicts Def/Res-7 on target and foes within 2 spaces of target through their next actions, and if bonus was granted to unit, deals 4 damage to unit.	5★

Assists

This Hero has no Assist skills that can be learned.

Specials

Skill Name	Effect	Learned At
Chilling Wind	(Cooldown Count = 4) Boosts damage dealt by 50% of unit’s Res.	5★
Iceberg	(Cooldown Count = 3) Boosts damage dealt by 50% of unit’s Res.	5★

Passives

Skill Name	Effect	Learned At
Darting Blow 1	If unit initiates combat, grants Spd+2 during combat.	5★
Swift Sparrow 1	If unit initiates combat, grants Atk/Spd +2 during combat.	5★
Swift Sparrow 2	If unit initiates combat, grants Atk/Spd +4 during combat.	5★
Atk/Res Bond 1	Grants Atk/Res +3 to this unit during combat if unit is adjacent to an ally.	5★
Atk/Res Bond 2	Grants Atk/Res +4 to this unit during combat if unit is adjacent to an ally.	5★
Atk/Res Bond 3	Grants Atk/Res +5 to this unit during combat if unit is adjacent to an ally.	5★
Atk/Res Unity	If unit is within 2 spaces of an ally, grants Atk/Res+5 and bonus to Atk/Res during combat = current penalty on each of those stats x 2 (Example: If unit has -7 penalty to Atk, grants Atk+19, for a net bonus of Atk+12.) Calculates each stat bonus independently.	5★
Mystic Boost 1	Disables foe’s skills that "calculate damage using the lower of foe’s Def or Res" and "calculate damage from staff like other weapons." Restores 2 HP after combat.	5★
Mystic Boost 2	Disables foe’s skills that "calculate damage using the lower of foe’s Def or Res" and "calculate damage from staff like other weapons." Restores 4 HP after combat.	5★
Mystic Boost 3	Disables foe’s skills that "calculate damage using the lower of foe’s Def or Res" and "calculate damage from staff like other weapons." Restores 6 HP after combat.	5★
Sparkling Boost+	At start of turn, restores 20 HP to ally that has been dealt the most damage. (Excludes unit.) At start of any ally's combat, if ally's HP≥ ≥ 50%, grants Res+5 to ally during combat. (Excludes unit.)	5★
Sparkling Boost	At start of turn, restores 10 HP to ally that has been dealt the most damage. (Excludes unit.)	5★

Eir as a Source Hero

Value of Skills	★★★★★

Inheriting Mystic Boost 3

Eir can be used to inherit the skill Mystic Boost 3. However, she is a Mythic Hero and will be very useful during Light Season and when used in Aether Raids, so we recommend leveling and building Eir before foddering or merging any duplicates.

List of Source Heroes

The Best Fodder Units

How to Get Eir / Illustrations / Voice Actor / Quotes

How to Get Eir

Obtain in Story Mode

Eir can be obtained automatically after clearing Book III - Chapter 1, Part 5 (Normal). When obtained, they will already be at a 5★ Rarity and have base stats (no IVs).

Obtained through a Special Summoning Event!

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

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

Current Focuses and Which You Should Pull From

Voice Actor and Illustrator Information

Voice Actor (English)	Xanthe Huynh
Illustrator	Kozaki Yusuke (コザキユースケ)
Appears In	Fire Emblem Heroes

Illustration

Quotes: Special Triggered

Special Triggered Quotes are voice lines that play upon activating a Special attack.

Lv 40 5★ Dialogue

Lv 40 5★ Dialogue become available when a hero attains Lv. 40 at 5★ rarity.

FEH: Related Guides

Heroes from Remix - Legendary & Mythic Hero Remix: Hríd & Eir
Hríd [8.5/10]	Múspell [9.0/10]	Naga [8.5/10]	Nifl [9.0/10]
Legendary Hector [9.0/10]	Yune [9.5/10]	Eir [8.5/10]	Fallen Edelgard [9.0/10]

See All Colorless Heroes

▶︎Return to the Colorless Heroes Page

All Types of Colorless Weapons

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