Eir Builds and Best IVs | Fire Emblem Heroes

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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.

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Eir - Merciful Death Icon Eir

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Eir Rating and Basic Information

FEH Eir Banner

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
Rarity
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★

Skill Name Might Range Effect
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.
-
Cooldown = 3
Boosts damage dealt by 50% of unit’s Res.
-
If unit initiates combat, grants Atk/Spd +4 during combat.
-
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.
-
At start of turn, restores 10 HP to ally that has been dealt the most damage. (Excludes unit.)

Eir Best IVs and Stats at Lv. 40

Stats

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

Base Stats (with Skills)

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

Recommended IVs

Stat Superboon/Superbane IV Recommendation
HP (16) HP Superboon ★★☆☆☆
Atk (22) No Attack IV ★★★★★
Spd (9) No Spd IV ★★★★☆
Def (4) Def Boon ★★★☆☆
Res (10) No Res IV ★★☆☆☆

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

IV Checker (All Heroes / All Rarities)

+ 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.

Stat Comparison of Similar Heroes

Hero
HP
Atk
Spd
Def
Res
Total
40 32 38 25 20 155
38 37 34 17 29 155
38 33 35 17 28 151
36 35 34 18 27 150
38 35 35 16 26 150
Eir Icon Eir
35 32 37 14 31 149

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

Eir Best Builds

Budget EirHOT

Weapon Skill IconLyfjaberg
Assist Skill IconDraw Back
Special Skill IconIceberg

See Explanation and Source Heroes

How to Use, Explanation

An explanation is not yet available.

Source Hero

Skill Hero
Eir - Merciful Death Icon Eir - Merciful Death (5★)
Eir - Merciful Death Icon Eir - Merciful Death (5★)
Eir - Merciful Death Icon Eir - Merciful Death (5★)
Eir - Merciful Death Icon Eir - Merciful Death (5★)
Eir - Merciful Death Icon Eir - Merciful Death (5★)

▶Other information regarding skills can be found here

Solo Desperation Eir

Weapon Skill IconLyfjaberg
Special Skill IconIceberg

See Explanation and Source Heroes

How to Use, Explanation

An explanation is not yet available.

Source Hero

Skill Hero
Eir - Merciful Death Icon Eir - Merciful Death (5★)
Eir - Merciful Death Icon Eir - Merciful Death (5★)
Eir - Merciful Death Icon Eir - Merciful Death (5★)

▶Other information regarding skills can be found here


Source Heroes for All Skills

Eir Best Weapon Refinement

Eir's Weapon Cannot Be Refined!

Eir's Exclusive Weapon currently cannot be refined. This section will be updated if it becomes refinable in the future.

About the Weapon Refinery

Eir Roles, Strengths, and Weaknesses

Eir Roles

Eir - Merciful Death Roles
Close Physical AttackClose-Physical Ranged Physical Attack ImageRanged-Physical Close Magic AttackClose-Magic Ranged MagicRanged-Magic
Physical Wall ImagePhysical Wall Magic Wall ImageMagic Wall Effective ImageEffective Weapon Movement Assist ImageMovement Assist
No All Range Counterattack ImageAll-Range Counterattack Recovery ImageRecovery No Refresher ImageRefresher Assist Legendary ImageLegendary/Mythic

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

Effect Atk Icon
Atk+3
Spd Icon
Spd+4
Def Icon
Def+5
Res Icon Res+5
Light Icon Peony - Sweet Dream Image Eir - Merciful Death Image
Astra Icon Altina - Dawn Naga - Dragon Divinity Image
Dark Icon Yune - Chaos Goddess Image Sothis - Girl on the Throne Image
Anima Icon Duma - God of Strength Image Líf - Lethal Swordsman Image Thrasir - Omnicidal Witch Image

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 follow-up attack blocking feature 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 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 10 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.

Excellent at tanking magic attacks

With the bonus from Lyfjaberg included, Eir has a base Res stat 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 Icon Hríd Soiree Ishtar Icon Soiree Ishtar Summer Camilla Icon Summer Camilla Thrasir Icon Thrasir
Yune Icon Yune Gunnthrá Icon Gunnthrá Leanne Icon Leanne Fallen Tiki (Young) Icon 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 Icon Sword Reinhardt Tibarn Icon Tibarn Keaton Icon Keaton Legendary Lucina Icon Legendary Lucina
Caineghis Icon Caineghis Legendary Alm Icon Legendary Alm Klein Icon Klein Brave Lyn Icon 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 for Eir?

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
3 2 After combat, inflicts Def/Res -3 on foe through its next action. 5★
5 2 After combat, inflicts Def/Res -3 on foe through its next action. 5★
7 2 After combat, inflicts Def/Res -5 on foe through its next action. 5★
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
(Cooldown Count = 4) Boosts damage dealt by 50% of unit’s Res. 5★
(Cooldown Count = 3) Boosts damage dealt by 50% of unit’s Res. 5★

Passives

Skill Name Effect Learned At
If unit initiates combat, grants Spd+2 during combat. 5★
If unit initiates combat, grants Atk/Spd +2 during combat. 5★
If unit initiates combat, grants Atk/Spd +4 during combat. 5★
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★
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★
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★
At start of turn, restores 10 HP to ally that has been dealt the most damage. (Excludes unit.) 5★

Eir as a Source Hero

Eir Avatar

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

    Illustration

    Eir.pngEnlarge Eir.pngEnlarge Eir.pngEnlarge Eir.pngEnlarge

    Quotes: Special Triggered

    See Special Triggered Quotes
    A merciful death.
    Fly, Lyfja!
    And now, you rest.
    You won’t suffer.

    Quotes: Castle

    See Castle Quotes
    This world is dazzling...the people, the trees, even the wind. The light of life is so...so...abundant.
    Hel, the realm of the dead... I lived there so long with only my mother.
    If you are tired, I’ll help you sleep. Just for the night—not forever.
    Imagine that your body is ravaged by incurable disease or wracked with pain that never ceases...
    You’d consider death a kindness then.
    My blade, Lyfja, offers death to those who seek it. To those who wish to live, it offers compassion instead.

    Lv 40 Dialogue

    See Lv 40 Dialogue
    Ah, {Summoner}... I apologize if I look gloomy to you. I am not used to smiling.
    Did I smile as a child? I can’t quite recall... My memories are so fuzzy, so faint...
    I remember giving Mother a flower. She smiled, and I was so happy.
    I am still that child. I would still love to make someone happy like I did then.
    Maybe...if I can bring you a little joy, my life would have some value to it.
    Please, tell me what I can do. If I could help, I’d be happy. I’d have accomplished something, at least.

    FEH: Related Links

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