Fire Emblem Heroes (FEH)

Spring Idunn Builds and Best IVs

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This is a ranking page for the hero Idunn - Dragonkin Duo 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 Spring Idunn.

Heroes With the Same Name
Idunn - Dragonkin Duo Icon Spring Idunn

Special Heroes - Familial Festivities (Revival) Featured Heroes
Spring Idunn IconSpring Idunn
[9.0/10]
Spring Est IconSpring Est
[9.0/10]
Spring Narcian IconSpring Narcian
[7.5/10]
Spring Fir IconSpring Fir
[8.5/10]

Spring Idunn Rating and Basic Information

FEH Spring Idunn Banner

Overall Rating 9.0/10
Reroll Ranking (excluding Inherit Skill) S
(▶Reroll Ranking)
Ranking (including Inherit Skill) S
(▶FEH Tier List)

Idunn - Dragonkin Duo: Basic Information

Color / Weapon Type / Move Type
Rarity
What Kind of Character Are They? Has a special Duo Skill
・Very powerful exclusive skill
・Gains a huge buff when initiated upon

Spring Idunn Skills at 5★


Might: 16  Range: 1
Effective against armored foes. Grants Res +3. If a bonus granted by a skill like Rally or Hone is active on unit or if unit is within 2 spaces of an ally, neutralizes unit's penalties and inflicts Atk -6 on foe during combat, and foe cannot make a follow-up attack. If foe's Range = 2, calculates damage using the lower of foe's Def or Res.

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

If foe initiates combat, grants. Atk/Def +6 during combat and inflicts Special cooldown charge -1 on foe per attack. (Only highest value applied. Does not stack.)

If unit’s HP ≥ 50% and foe initiates combat, unit makes a guaranteed follow-up attack. Grants Special cooldown charge +1 per attack. (Does not stack. )

Grants Atk/Spd +4 to dragon allies within 2 spaces during combat.

Spring Idunn's Duo Skill Effect

Duo Skill
Grants Def/Res+6 and the following status to unit and allies within 5 rows and 5 columns centered on unit for 1 turn: "Neutralizes 'effective against dragons' bonuses and 'effective against armored' bonuses."
(Duo Skills can be used once per map by tapping the Duo button. Duo Skills cannot be used by units deployed using Pair Up.)

Standard Effect 1

Duel
If unit is 5★ and level 40 and unit's stats total less than 185, treats unit's stats as 185 in modes like Arena. (Higher-scoring opponents will appear. Stat total calculation excludes any values added by merges and skills.)

Spring Idunn Best IVs

Recommended IVs

Stat Superboon/Superbane IV Recommendation
HP (20) Normal HP ★★★☆☆
Atk (25) No Attack IV ★★★★☆
Spd (4) Spd Bane ★★☆☆☆
Def (7) Def Boon ★★★★★
Res (11) Res Boon ★★★★☆

◯ = 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.

+Def and -Spd!

S!Idunn's best IVs are +Def and -Spd. With a Spd boon, she gets Def+4, making her even more resistant against physical attacks. Since she doesn't really need to worry about enemy follow-up attacks, thanks to her weapon skill, you can safely take a Spd bane.

+Def for a +10 Merge

If you are building a +10 merged S!Idunn, we recommend +Def. This will make her extremely strong against your foes' physical attacks. If you want her to be a more offense based unit, +Atk is a good choice as well.

Spring Idunn Best Builds

Far Save Spring Idunn

HOT
Assist Skill IconPivot
Special Skill IconBonfire
Emblem Icon: -
Attuned Skill Icon: -

How to Use, Explanation

This build uses Far Save to cover the team from ranged attacks, especially in Aether Raids. Most opponents run Windsweep abusers to fight Far Save Brave Hectors, and Spring Idunn ignores all of that and still retaliates.

Budget Spring Idunn

Assist Skill IconPivot
Special Skill IconIceberg
Emblem Icon: -
Attuned Skill Icon: -

How to Use, Explanation

Spring Idunn's kit is already very complete, so you do not need much investment to make her effective. Mystic Boost 3 is helpful in most situations, and Pivot helps a lot in positioning her for enemy phase battle.

Source Heroes for All Skills

Spring Idunn Best Weapon Refine

Effect of Spring Idunn's Weapon Refine

Exclusive Weapon Effect from Refining (Special Effect Type)
SP: 400
Might: 16 Range: 1 HP: 3
Effective against armored foes. Grants Res+3. If 【Bonus】 is active on unit or if unit is within 2 spaces of an ally, inflicts Atk-6 and Spd/Def/Res-4 on foe, neutralizes unit's penalties, and foe cannot make a follow-up attack during combat. If foe's Range = 2, calculates damage using the lower of foe's Def or Res.
If foe initiates combat or foe's HP ≥ 75% at start of combat, inflicts Atk/Spd/Def/Res-4 on foe during combat, reduces damage from foe's first attack by 5 during combat ("first attack" normally means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes), and restores 7 HP to unit after combat, and also, if unit's Res> foe's Res, reduces damage from attacks during combat and from area-of-effect Specials (excluding Røkkr area-of-effect Specials) by percentage= difference between stats x 4 (max 40%).
Arena Medal:500 Divine Dew:200

We recommend the Special Effect Refine for Zephyr Breath

The new weapon refine of Zephyr Breath greatly improves Spring Idunn's tanking capabilities. It now provides damage reduction on enemy-phase turns, stat debuffs on enemies, and HP recovery of 7 after every combat.

Spring Idunn Stats

Stat Rankings

Neutral Stats at Lv. 40 (5★)
184
HP
HP 46 46
Rank: 59/1077
Atk
Atk 37 37
Rank: 398/1077
Spd
Spd 26 26
Rank: 752/1077
Def
Def 37 37
Rank: 110/1077
Res
Res 38 38
Rank: 69/1077

Stat Values

Lv 40+10 Stats (5★)

HP Atk Spd Def Res Total
+10 Merges W/ Skill Bonuses 51 58 30 41 46 226
Lv.40 +10 51 42 30 41 43 207

HP Atk Spd Def Res Total
+HP
Lv.40 +10
53 41 30 41 42 207
+Atk
Lv.40 +10
50 44 30 41 42 207
+Spd
Lv.40 +10
50 41 33 41 42 207
+Def
Lv.40 +10
50 41 30 45 42 208
+Res
Lv.40 +10
50 41 30 41 46 208

Stats at Lv 40

HP Atk Spd Def Res Total
5★- Adjusted for Skills 46 53 26 37 41 203
5★ Lv.40 46 37 26 37 38 184

Initial Stats (with Skills)

HP Atk Spd Def Res Total
5★ Lv.1 20 25 4 7 11 67

Stat Comparison of Similar Heroes

Hero
HP
Atk
Spd
Def
Res
Total
47 46 19 40 43 195
Spring Idunn Icon Spring Idunn
46 37 26 37 38 184
45 45 14 41 39 184
45 35 26 39 34 179
46 38 23 40 32 179

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

Spring Idunn Roles, Strengths, and Weaknesses

Spring Idunn Roles

Idunn - Dragonkin Duo Roles
Close Physical AttackClose-Physical Ranged Physical AttackRanged-Physical Close Magic Attack ImageClose-Magic Ranged MagicRanged-Magic
Physical Wall ImagePhysical Wall Magic Wall ImageMagic 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 Duo and Harmonized ImageDuo /
Harmonized
No Resplendent ImageResplendent

Spring Idunn is a close magic attacker (range = 1). Therefore, when not accounting for the Weapon Triangle, the amount of damage she deals will be equivalent to her Atk minus the foe's Res stat. On top of this, she has access to an additional Duo Skill, which can be activated once per battle.

Duo Skill Usable in Arenas

S!Idunn's Duo Skill raises her arena score, in addition to unleashing a powerful battle effect. Duo Heroes have a Duo Skill which can be used once per map. Additionally, her Duel effect treats her stats as 185 in Arena modes, giving her a big advantage over many other heroes.

The effect of Idunn's Duo Skill is shown below

Duo Skill Idunn.png

Grants Def/Res+6 and the following status to unit and allies within 5 rows and 5 columns centered on unit for 1 turn: Neutralizes 'effective against dragons' bonuses and 'effective against armored' bonuses.
(Duo Skills can be used once per map by tapping the Duo button. Duo Skills cannot be used by units deployed using Pair Up.)

Standard Effect 1: Duel
If unit is 5★ and level 40 and unit's stats total less than 185, treats unit's stats as 185 in modes like Arena. (Higher-scoring opponents will appear. Stat total calculation excludes any values added by merges and skills.)

Idunn Strengths

Duo Skill can nullify dragon effective skills

Spring Idunn has the power to use a unique Duo Skill once per map. This will grant Def/Res+6 to Idunn and an ally and also block skills that are effective on armor and dragons, making her ideal in both armor or dragon parties.

Can nullify penalties and prevent follow-up attacks

Idunn's exclusive weapon Zephyr Breath will allow her to block penalties on her, inflict Atk-6, and prevent follow-up attacks from a foe when she has an active Rally/Hone skill on her, or she is within two spaces of an ally. As an added bonus, it is effective on armored foes and ranged foes, making Idunn very versatile and powerful in a number of different team types.

Gains a lot of extra oomph when the foe strikes first

With her A Skill Sturdy Stance, and her B Skill Vengeful Fighter, Idunn is made for tanking the foes' attacks. Each time she does this, she will gain Atk/Def+6 and a guaranteed follow-up attack, which will allow her to easily take down a ton of units in the enemy phase.

Idunn Weaknesses

Weak to both dragon and armor effective weapons

Like regular Idunn, Spring Idunn has two weaknesses, so units with dragon/armor-effective weapons can quickly take her down. Her Duo Skill can temporarily cancel this out, but you will still need to keep a close eye on enemy unit's weapons.

Heroes with Effective Skills

Spring Idunn Team and Counters

Teammates for Spring Idunn

Idunn IconIdunn Ninian IconNinian Naga IconNaga Seiros IconSeiros
Nagi IconNagi Legendary Robin (F) IconLegendary Robin (F) Spring Myrrh IconSpring Myrrh Duma IconDuma

Dragon Teams

Spring Idunn can take advantage of being in an all-dragon team, receiving buffs from Hone Dragons or Goad Dragons.

Armor Teams

She can also be placed in an all-armor team, who have buffs like Armor March 3 or Hone Armor.

Spring Idunn Counters

Idunn IconIdunn Itsuki IconItsuki Exalt Chrom IconExalt Chrom Legendary Marth IconLegendary Marth
Halloween Tiki (Young) IconHalloween Tiki (Young) Reinhardt IconReinhardt Naga IconNaga Brave Hector IconBrave Hector

Heroes with Dragon-Effective Weapons or Specials

As a dragon, Spring Idunn is weak to weapons that are effective against dragons.

Be mindful, as well, of units that have Ruptured Sky. They have the potential to one shot her because of the damage that Ruptured Sky can bring.

Heroes with Armor-Effective Weapons

Spring Idunn can also be defeated by weapons like Armorsmasher+ or Light of Dawn.

Even if she has high Res, Spring Idunn does not have Distant Counter built in, so you can chip away at her with magic damage.

Should you Unlock Potential?

Should You Unlock Potential for this Hero? Cannot Unlock Potential

Idunn - Dragonkin Duo Only Appears as a 5 Star Hero!

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

Unlock Potential Tier List

Spring Idunn - List of Skills

Weapons

Skill Name Might Range Effect Learned At
6 1 No Effect 5★
8 1 No Effect 5★
11 1 No Effect 5★
16 1 Effective against armored foes. Grants Res +3. If a bonus granted by a skill like Rally or Hone is active on unit or if unit is within 2 spaces of an ally, neutralizes unit's penalties and inflicts Atk -6 on foe during combat, and foe cannot make a follow-up attack. If foe's Range = 2, calculates damage using the lower of foe's Def or Res. 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
Grants Def +2 during combat when this unit is attacked. 5★
If foe initiates combat, grants Atk/Def +2 during combat. 5★
If foe initiates combat, grants Atk/Def +4 during combat. 5★
If foe initiates combat, grants. Atk/Def +6 during combat and inflicts Special cooldown charge -1 on foe per attack. (Only highest value applied. Does not stack.) 5★
If unit’s HP ≥ 90% and foe initiates combat, unit makes a guaranteed follow-up attack. Grants Special cooldown charge +1 per attack. (Does not stack. ) 5★
If unit’s HP ≥ 70% and foe initiates combat, unit makes a guaranteed follow-up attack. Grants Special cooldown charge +1 per attack. (Does not stack. ) 5★
If unit’s HP ≥ 50% and foe initiates combat, unit makes a guaranteed follow-up attack. Grants Special cooldown charge +1 per attack. (Does not stack. ) 5★
Grants adjacent allies Atk +2 during combat. 5★
Grants adjacent allies Atk +3 during combat. 5★
Grants Atk/Spd +4 to dragon allies within 2 spaces during combat. 5★

Spring Idunn as a Source Hero

Spring Idunn Avatar

Value of Skills ★★★★★

Inheriting Sturdy Stance 3

Spring Idunn can be used to inherit the skill Sturdy Stance 3. However, since Spring Idunn is a powerful special hero that you can only obtain from a special heroes banner, we recommend training and building her instead. In fact, she is one of the best red heroes around! We recommend investing in her instead of foddering her off. If you get multiple copies, you should start a merge project for Spring Idunn!

How to Get Spring Idunn / Illustrations / Voice Actor / Quotes

How to Get Spring Idunn

Obtained through a Special Summoning Event!

Spring Idunn 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)
Sarah Blandy
Illustrator Umiu Geso
Appears In

FEH: Related Guides

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