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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 | |
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List of Contents
| Special Heroes - A New Self Featured Heroes | |||
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Summer Eikþyrnir[9.5/10] |
Summer Hapi[9.5/10] |
Summer Yuri[9.5/10] |
Summer Heiðrún[9.5/10] |

| Overall Rating | 9.5/10 |
|---|---|
| Reroll Ranking (excluding Inherit Skill) |
A (▶Reroll Ranking) |
| Ranking (including Inherit Skill) |
S (▶FEH Tier List) |
| 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. |
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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. |
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Cooldown Count = 3 Boosts damage dealt by 50% of unit’s Def. |
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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. |
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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. |
| Stat | Superboon/Superbane | IV Recommendation |
|---|---|---|
| HP (21) |
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★★★★☆ |
| Atk (10) |
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★★★★★ |
| Spd (4) |
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★☆☆☆☆ |
| Def (10) |
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★★★★★ |
| Res (8) |
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★★★☆☆ |
◯ = 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.
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.
We recommend +Atk or +Def when merging Summer Eikþyrnir up to +10 depending on your build.
| HOT | |
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| Updated on 07/08/2025 | |
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.
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| Updated on 07/08/2025 | |
This budget build allows Summer Eikþyrnir to fulfill his role as a frontline bruiser unit using skills acquired from Divine Codes.
| Neutral Stats at Lv. 40 (5★) | ||
|---|---|---|
| 190 | ||
| HP |
45 |
Rank: 124/1322 |
| Atk |
49 |
Rank: 3/1322 |
| Spd |
17 |
Rank: 1193/1322 |
| Def |
49 |
Rank: 2/1322 |
| Res |
30 |
Rank: 442/1322 |
| 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 |
| 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 |
| HP | Atk | Spd | Def | Res | Total | |
|---|---|---|---|---|---|---|
| 5★ Lv.1 | 21 | 24 | 4 | 10 | 8 | 67 |
| 4★ Lv.1 | 20 | 19 | 3 | 10 | 7 | 59 |
| 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 | |
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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 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'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.
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.
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!
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!
| Should You Unlock Potential for this Hero? |
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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.
| 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★ |
| This Hero has no Assist skills that can be learned. |
| 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★ |
| 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★ |

| 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 |
If you have feedback about this hero page, let us know in the comments section below!
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 (English) |
Takeuchi Shunsuke |
|---|---|
| Illustrator | P-POCO |
| Appears In |
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| Heroes from Special Heroes - A New Self | |||
|---|---|---|---|
Summer Eikþyrnir[9.5/10] |
Summer Hapi[9.5/10] |
Summer Yuri[9.5/10] |
Summer Heiðrún[9.5/10] |
▶︎Return to the Red Heroes Page
| Close-Range | Ranged |
|---|---|
Sword |
Red Tome |
Red Breath |
Red Dagger |
Red Beast |
Red Bow |
Summer Eikþyrnir Builds and Best IVs



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