Spring Idunn Builds and Best IVs

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	Spring Idunn
Ascended Idunn

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

Spring Idunn Rating and Basic Information

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

Idunn - Dragonkin Duo: Basic Information

Color / Weapon Type / Move Type	Red / Red Breath / Armored
Rarity	5 Star
What Kind of Character Are They?	・Refined Zephyr Breath grants armor-effective damage, neutralizes Idunn's penalties, inflicts stat penalties onto foe, denies foe's follow-up attack, and grants damage reduction and post-combat healing to Idunn. ・Duo Skill grants Def/Res bonuses and both armor and dragon weakness negation to Idunn and allies.

Spring Idunn Skills at 5★

Zephyr Breath 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.

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

Sturdy Stance 3 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.)

Vengeful Fighter 3 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. )

Goad Dragons 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)		★★★☆☆
Atk (25)		★★★★☆
Spd (4)		★★☆☆☆
Def (7)		★★★★★
Res (11)		★★★★☆

◯ = 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

Near Save Spring Idunn

HOT
： Zephyr Breath ： Pivot ： Dragon's Roar ： -	： Def/Res Scowl 4 ： High Dragon Wall ： D/R Near Save 3 ： Wily Fighter 3 ： -

How to Use, Explanation

This build maximizes bulk using High Dragon Wall. Def/Res Scowl 4 improves bulk and slows down foe's Specials. Wily Fighter grants a guaranteed follow-up attack.

Budget Spring Idunn

： Zephyr Breath ： Pivot ： Iceberg ： -

： Sturdy Stance 3 ： Vengeful Fighter 3 ： Goad Dragons ： Distant Counter (D) ： -

How to Use, Explanation

Spring Idunn's kit is already usable on a budget, so you do not need much investment to make her effective.

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)
Zephyr Breath	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%). ：500　：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	46	Rank: 71/1171
Atk	37	Rank: 584/1171
Spd	26	Rank: 910/1171
Def	37	Rank: 156/1171
Res	38	Rank: 127/1171

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

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
Halloween Nagi	49	48	17	45	48	207
Halloween Duma	47	46	19	40	43	195
Spring Idunn	46	37	26	37	38	184
Dheginsea	45	45	14	41	39	184
Halloween Myrrh	46	38	23	40	32	179
Idunn	45	35	26	39	34	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	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

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

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	Ninian	Naga	Seiros
Nagi	Legendary Robin (F)	Duma	Spring Myrrh

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

Exalt Chrom	Legendary Marth	Idunn	Itsuki
Brave Hector	Reinhardt	Naga	Halloween Tiki (Young)

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
Fire Breath	6	1	No Effect	5★
Fire Breath+	8	1	No Effect	5★
Flametongue	11	1	No Effect	5★
Zephyr Breath	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
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
Steady Stance 1	Grants Def +2 during combat when this unit is attacked.	5★
Sturdy Stance 1	If foe initiates combat, grants Atk/Def +2 during combat.	5★
Sturdy Stance 2	If foe initiates combat, grants Atk/Def +4 during combat.	5★
Sturdy Stance 3	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★
Vengeful Fighter 1	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★
Vengeful Fighter 2	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★
Vengeful Fighter 3	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★
Spur Atk 1	Grants adjacent allies Atk +2 during combat.	5★
Spur Atk 2	Grants adjacent allies Atk +3 during combat.	5★
Goad Dragons	Grants Atk/Spd +4 to dragon allies within 2 spaces during combat.	5★

Spring Idunn as a Source Hero

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!

• List of Source Heroes
• The Best Fodder Units

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	Fire Emblem: The Binding Blade

FEH: Related Guides

Special Heroes: Familial Festivities (Revival)

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

See All Red Heroes

▶︎Return to the Red Heroes Page

All Types of Red Weapons

Close-Range	Ranged
Sword	Red Tome
Red Breath	Red Dagger
Red Beast	Red Bow