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Fire Emblem Heroes (FEH)

Summer Eikþyrnir Builds and Best IVs

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★ Latest Banners - New Heroes: Harmonized CYL Ike, Lyn
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FEH Summer Eikþyrnir Banner

This is a ranking page for the hero Eikþyrnir - Fit for Waves 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 Summer Eikþyrnir.

Heroes With the Same Name
Eikþyrnir - Fit for Waves Icon Summer Eikþyrnir

Special Heroes - A New Self Featured Heroes
Summer Eikþyrnir IconSummer Eikþyrnir
[9.5/10]
Summer Hapi IconSummer Hapi
[9.5/10]
Summer Yuri IconSummer Yuri
[9.5/10]
Summer Heiðrún IconSummer Heiðrún
[9.5/10]

Summer Eikþyrnir Rating and Basic Information

FEH Summer Eikþyrnir Banner

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

Eikþyrnir - Fit for Waves: Basic Information

Color / Weapon Type / Move Type
Rarity
What Kind of Character Are They? ・Ocean-Fit Antler grants Atk/Def+6, a guaranteed follow-up, a Dull All effect, and an extra +3 to stat bonuses to Eikþyrnir and nearby allies at start of turn, grants Eikþyrnir bonus stats, true damage, true DR on foe's first attack, and a Special cooldown jumping effect.
・Divine Brawn grants 【Canto (2)】, removes transformation conditions, neutralizes all【Penalty】 effects on Eikþyrnir, inflicts Atk/Def penalties on foe, grants Eikþyrnir a 50% DR piercing effect and 7 HP post-combat healing.

Summer Eikþyrnir Skills at 5★


Might: 14  Range: 1
Accelerates Special trigger (cooldown count-1).
At start of turn, if unit is within 2 spaces of an ally, grants Atk/Def+6, "neutralizes foe's bonuses during combat," and "unit makes a guaranteed follow-up attack during combat" to unit and allies within 2 spaces of unit for 1 turn.
If unit is within 2 spaces of an ally, and if unit and allies within 2 spaces of unit have bonuses to Atk/Spd/Def/Res after start-of-turn skills trigger, grants an additional +3 to each corresponding stat for unit and those allies for 1 turn (calculates each stat bonus independently; max 10).
If unit initiates combat or is within 2 spaces of an ally, grants bonus to unit's Atk/Def/Res = number of allies within 3 rows or 3 columns centered on unit x 3, + 5 (max 14), unit deals +X damage (excluding area-of-effect Specials), reduces damage from foe's attacks by 50% of X (excluding area-of-effect Specials), and grants Special cooldown count-X ÷ 12 (rounded down) to unit before unit's first attack during combat (X = highest total bonuses among unit and allies within 3 spaces of unit).
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 also, inflicts Atk/Def-Y on foe during combat (Y = number of spaces from start position to end position of whoever initiated combat + 3; max 6), and also, if Y ≥ 5, reduces damage from foe's first attack by 30% during combat.

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

If number of adjacent allies other than beast or dragon allies ≤ 1, or if unit is transformed, grants Atk/Def+7 to unit during combat and grants Special cooldown charge +1 to unit per attack during combat (only highest value applied; does not stack), and restores 7 HP to unit after combat.

Enables 【Canto (2)】.
Removes the condition to transform. If defending in Aether Raids, at the start of enemy turn 1, if unit can transform, unit transforms.
After start-of-turn effects trigger on player phase or enemy phase, neutralizes any 【Penalty】 on unit (does not apply to 【Penalty】 effects that are applied at the same time).
At start of combat, if unit's Atk ≥ foe's Atk-5, inflicts Atk/Def-7 on foe during combat. At start of combat, if unit's Def ≥ foe's Def-5, inflicts Atk/Def-7 on foe during combat.
Inflicts Atk/Def-5 on foe and reduces the percentage of foe's non-Special "reduce damage by X%" skills by 50% during combat (excluding area-of-effect Specials), and restores 7 HP to unit after combat.

Summer Eikþyrnir Best IVs

Recommended IVs

Stat Superboon/Superbane IV Recommendation
HP (21) Normal HP ★★★★☆
Atk (10) Attack Boon ★★★★★
Spd (4) Spd Bane ★☆☆☆☆
Def (10) Def Boon ★★★★★
Res (8) Res Bane ★★★☆☆

◯ = 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 or +Def / -Spd

The best IVs for Summer Eikþyrnir are either +Atk or +Def and -Spd. Both Atk and Def are superboons and boost Eikþyrnir's Atk or Def from base 49 to base 53. Opt for the boon that your preferred build requires; Atk for an offensive focus and Def for a more defensive build.

Spd is Eikþyrnir's least important stat and can be safely taken as a bane.

+Atk or +Def for a +10 merge

We recommend +Atk or +Def when merging Summer Eikþyrnir up to +10 depending on your build.

Summer Eikþyrnir Best Builds

Bruiser Summer Eikþyrnir

HOT
Attuned Skill Icon: -
Updated on 07/08/2025

How to Use, Explanation

Summer Eikþyrnir excels as a bruiser unit, functioning as both an attacker and a frontline tank. Emblem Sigurd Ring extends his mobility and improves his Canto from 2 to 3.

Budget Summer Eikþyrnir

Special Skill IconBonfire
Emblem Icon: -
Attuned Skill Icon: -
Updated on 07/08/2025

How to Use, Explanation

This budget build allows Summer Eikþyrnir to fulfill his role as a frontline bruiser unit using skills acquired from Divine Codes.

Source Heroes for All Skills

Summer Eikþyrnir Stats

Stat Rankings

Neutral Stats at Lv. 40 (5★)
190
HP
HP 45 45
Rank: 124/1322
Atk
Atk 49 49
Rank: 3/1322
Spd
Spd 17 17
Rank: 1193/1322
Def
Def 49 49
Rank: 2/1322
Res
Res 30 30
Rank: 442/1322

Stat Values

Lv 40+10 Stats (5★)

HP Atk Spd Def Res Total
+10 Merges W/ Skill Bonuses 50 68 21 54 34 227
Lv.40 +10 50 54 21 54 34 213

HP Atk Spd Def Res Total
+HP
Lv.40 +10
52 53 21 53 34 213
+Atk
Lv.40 +10
49 57 21 53 34 214
+Spd
Lv.40 +10
49 53 24 53 34 213
+Def
Lv.40 +10
49 53 21 57 34 214
+Res
Lv.40 +10
49 53 21 53 37 213

Stats at Lv 40

HP Atk Spd Def Res Total
5★- Adjusted for Skills 45 63 17 49 30 204
5★ Lv.40 45 49 17 49 30 190
4★ Lv.40 42 47 15 47 27 178

Initial Stats (with Skills)

HP Atk Spd Def Res Total
5★ Lv.1 21 24 4 10 8 67
4★ Lv.1 20 19 3 10 7 59

Stat Comparison of Similar Heroes

Hero
HP
Atk
Spd
Def
Res
Total
41 46 48 36 24 195
40 47 48 42 18 195
40 46 49 36 24 195
Summer Eikþyrnir Icon Summer Eikþyrnir
45 49 17 49 30 190
40 46 48 35 21 190
46 48 20 48 28 190
40 44 47 35 24 190
40 47 45 36 21 189
45 47 16 47 30 185
40 46 47 33 19 185
40 45 47 32 21 185
40 44 46 34 21 185
40 42 47 30 20 179
41 46 16 41 35 179
40 44 46 33 16 179
40 43 40 35 21 179
40 41 44 32 21 178
40 37 42 27 28 174
41 38 16 38 35 168
41 35 39 25 28 168
40 38 44 24 22 168
40 39 43 25 20 167
41 35 41 27 18 162
35 31 39 16 40 161
41 29 34 30 23 157
40 35 33 32 17 157
40 30 37 33 17 157
41 33 38 26 19 157
35 29 38 19 35 156
38 32 36 25 25 156

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

Summer Eikþyrnir Roles, Strengths, and Weaknesses

Summer Eikþyrnir Roles

Eikþyrnir - Fit for Waves Roles
Close Physical Attack ImageClose-Physical Ranged Physical AttackRanged-Physical Close Magic AttackClose-Magic Ranged MagicRanged-Magic
Physical Wall ImagePhysical Wall Magic WallMagic Wall Effective ImageEffective Weapon Movement Assist ImageMovement Assist
Exclusive Skill ImageExclusive Skill No All Range Counterattack ImageAll-Range Counter RecoveryRecovery No Refresher ImageRefresher
No Legendary Hero ImageLegendary No Mythic Hero ImageMythic No Duo and Harmonized ImageDuo /
Harmonized
No Resplendent ImageResplendent

Summer Eikþyrnir 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.

Summer Eikþyrnir Strengths

Ocean-Fit Antler provides great support and improves combat

Summer Eikþyrnir Attack

Summer Eikþyrnir's exclusive weapon Ocean-Fit Antler grants Atk/Def+6, a guaranteed follow-up attack, and a neutralizes foe's bonuses effect to himself and nearby allies at the start of each turn.

Ocean-Fit Antler also grants an additional +3 to each active stat bonus on Eikþyrnir and his nearby allies after start-of-turn skills trigger, providing a small stat boost on top of already active stat boosts.

In combat, Ocean-Fit Antler grants Eikþyrnir up to Atk/Spd/Def/Res+14 based on number of allies within 3 rows or 3 columns centered on Eikþyrnir, bonus true damage equal to the highest total bonuses among Eikþyrnir and allies within 3 spaces, bonus true damage reduction equal to half that amount, and Special cooldown count reduction before his first attack equal to 1/12th of that amount (rounded down).

Assuming a common case of Summer Eikþyrnir or a nearby ally having Atk/Spd/Def/Res+9 visible bonuses, from the standard Atk/Spd/Def/Res+6 and the additional +3 from Ocean-Fit Antler, Eikþyrnir will then receive +36 bonus true damage, +18 bonus true damage reduction, and Special cooldown count -3 before his first attack during combat. These are fantastic bonuses to receive in combat, so make sure you set up Summer Eikþyrnir for success through teambuilding and positioning!

Ocean-Fit Antler also has the standard Beast Cavalry transformation effects, granting Atk+2, 30% damage reduction on foe's first attack, and inflicting Atk/Def penalties on his foe based on distance traveled.

Divine Brawn grants Canto (2), allows transformation at all times, and neutralizes all 【Penalty】 effects

Summer Eikþyrnir's exclusive B skill Divine Brawn grants 【Canto (2)】 and removes all transformation conditions, ensuring Eikþyrnir is always transformed.

After start-of-turn effects trigger, Divine Brawn also cleanses all 【Penalty】 effects applied to Eikþyrnir, ensuring he is not hindered by enemy penalties.

Divine Brawn also inflicts up to Atk/Def-19 on Eikþyrnir's foe in combat based on Atk and Def checks, cuts his foe's non-Special damage reduction effects in half, and grants him 7 HP post-combat healing.

Divine Brawn is a good flexible skill, granting various effects that improve Eikþyrnir's combat potential.

Summer Eikþyrnir Weaknesses

Weak to Cavalry Effective Weapons

X takes 1.5x damage from cavalry-effective weapons like Thani or Binding Reginleif, 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

X 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? SS Rank Icon

We Highly Recommend You Unlock Potential for Eikþyrnir - Fit for Waves!

We can say with confidence that you should use Unlock Potential to bring Eikþyrnir - Fit for Waves from 4 Stars to 5 Stars as soon as possible. Eikþyrnir - Fit for Waves is a very strong unit that can carry maps in multiple game modes, so we highly recommend you Unlock Potential for Eikþyrnir - Fit for Waves.

Unlock Potential Tier List

Summer Eikþyrnir - List of Skills

Weapons

Skill Name Might Range Effect Learned At
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 if unit initiates combat, inflicts Atk/Def-4 on foe during combat 3★
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 if unit initiates combat, inflicts Atk/Def-4 on foe during combat 3★
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, unit can move 1 extra space. (That turn only. Does not stack.) If unit transforms, 3★
14 1 Accelerates Special trigger (cooldown count-1).
At start of turn, if unit is within 2 spaces of an ally, grants Atk/Def+6, "neutralizes foe's bonuses during combat," and "unit makes a guaranteed follow-up attack during combat" to unit and allies within 2 spaces of unit for 1 turn.
If unit is within 2 spaces of an ally, and if unit and allies within 2 spaces of unit have bonuses to Atk/Spd/Def/Res after start-of-turn skills trigger, grants an additional +3 to each corresponding stat for unit and those allies for 1 turn (calculates each stat bonus independently; max 10).
If unit initiates combat or is within 2 spaces of an ally, grants bonus to unit's Atk/Def/Res = number of allies within 3 rows or 3 columns centered on unit x 3, + 5 (max 14), unit deals +X damage (excluding area-of-effect Specials), reduces damage from foe's attacks by 50% of X (excluding area-of-effect Specials), and grants Special cooldown count-X ÷ 12 (rounded down) to unit before unit's first attack during combat (X = highest total bonuses among unit and allies within 3 spaces of unit).
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 also, inflicts Atk/Def-Y on foe during combat (Y = number of spaces from start position to end position of whoever initiated combat + 3; max 6), and also, if Y ≥ 5, reduces damage from foe's first attack by 30% during combat.
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 Def. 3★
(Cooldown Count = 3) Boosts damage dealt by 50% of unit’s Def. 4★

Passives

Skill Name Effect Learned At
If unit is not adjacent to an ally, grants Atk/Def+2 during combat. 3★
If unit is not adjacent to an ally, grants Atk/Def+4 during combat. 3★
If unit is not adjacent to an ally, grants Atk/Def+6 during combat. 4★
If number of adjacent allies other than beast or dragon allies ≤ 1, or if unit is transformed, grants Atk/Def+7 to unit during combat and grants Special cooldown charge +1 to unit per attack during combat (only highest value applied; does not stack), and restores 7 HP to unit after combat. 5★
Enables 【Canto (2)】.
Removes the condition to transform. If defending in Aether Raids, at the start of enemy turn 1, if unit can transform, unit transforms.
After start-of-turn effects trigger on player phase or enemy phase, neutralizes any 【Penalty】 on unit (does not apply to 【Penalty】 effects that are applied at the same time).
At start of combat, if unit's Atk ≥ foe's Atk-5, inflicts Atk/Def-7 on foe during combat. At start of combat, if unit's Def ≥ foe's Def-5, inflicts Atk/Def-7 on foe during combat.
Inflicts Atk/Def-5 on foe and reduces the percentage of foe's non-Special "reduce damage by X%" skills by 50% during combat (excluding area-of-effect Specials), and restores 7 HP to unit after combat.
5★

Summer Eikþyrnir as a Source Hero

Summer Eikþyrnir Avatar

Value of Skills ★★★☆☆

Summer Eikþyrnir has Atk/Def Wild as his only good skill for Skill Inheritance.

We recommend merging your Summer Eikþyrnir copies instead.

List of Source Heroes The Best Fodder Units

Community Feedback

How would you rate Summer Eikþyrnir?

Top tier hero. Must promote and merge. 15
Votes
Promote if you need his/her archetype. 1
Votes
Promote to 5 stars if you like this hero. 1
Votes
Summon for his/her Skill Inheritance options. 0
Votes
Pass on this hero. 0
Votes

If you have feedback about this hero page, let us know in the comments section below!

How to Get Summer Eikþyrnir / Illustrations / Voice Actor / Quotes

How to Get Summer Eikþyrnir

Obtained through a Special Summoning Event!

Summer Eikþyrnir is a limited time Hero who can be pulled from a Special Heroes 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)
Takeuchi Shunsuke
Illustrator P-POCO
Appears In

Illustration

FEH: Related Guides

Special Heroes: A New Self

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Summer Eikþyrnir IconSummer Eikþyrnir
[9.5/10]
Summer Hapi IconSummer Hapi
[9.5/10]
Summer Yuri IconSummer Yuri
[9.5/10]
Summer Heiðrún IconSummer Heiðrún
[9.5/10]

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Comment

1 Eikþyrnir’s subby husband Eikþyrnir’s subby husband 5 months

20/10 his brave debut is saved bc he knows I'm too cute to not make a free pull debut

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