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Fire Emblem Heroes (FEH)

Ferox Fir Builds and Best IVs

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FEH Ferox Fir Banner

This is a ranking page for the hero Fir - Dual Warriors 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 Ferox Fir.

Heroes With the Same Name
Fir - Dual Warriors Icon Ferox Fir

Special Heroes - Beside Kin Featured Heroes
Ferox Fir IconFerox Fir
[9.9/10]
Ferox Marth IconFerox Marth
[9.5/10]
Ferox Chulainn IconFerox Chulainn
[8.5/10]
Ferox Chrom IconFerox Chrom
[9.5/10]
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Ferox Fir Rating and Basic Information

FEH Ferox Fir Banner

Overall Rating 9.9/10
Reroll Ranking (excluding Inherit Skill) S
(▶Reroll Ranking)
Ranking (including Inherit Skill) SS
(▶FEH Tier List)

Fir - Dual Warriors: Basic Information

Color / Weapon Type / Move Type
Rarity
What Kind of Character Are They? ・Princesses' Edge has built-in Preempt Pulse, inflicts Discord, Spd Shackle, and Def Shackle onto multiple foes, grants Fir bonus stats, bonus uncapped true damage, true damage reduction, a Null Follow-Up effect, and Special cooldown charges per attack.
・Harmonized Skill grants Resonance Blades and Special cooldown count -2 to Fir and allies from similar titles and also allows a second use of once-per-turn effects on Specials.

Ferox Fir Skills at 5★


Might: 16  Range: 1
Accelerates Special trigger (cooldown count-1).
At start of turn, grants Special cooldown count-2 to unit.
At start of turn and after unit acts (if Canto triggers, after Canto), inflicts Spd/Def-7, 【Discord】,【Spd Shackle】, and 【Def Shackle】 on closest foes and foes within 2 spaces of those foes through their next actions.
If unit initiates combat or is within 2 spaces of an ally, grants bonus to unit's Atk/Spd/Def/Res = number of allies within 3 rows or 3 columns centered on unit × 3, + 5 (max 14), unit deals +X × 3 damage (excluding area-of-effect Specials; X = number of Bonus effects and Penalty effects active on target and foes within 2 spaces of target, excluding stat bonuses and stat penalties), reduces damage from foe's attacks by 20% of unit's Spd (excluding area- of-effect Specials), neutralizes effects that guarantee foe's follow-up attacks and effects that prevent unit's follow-up attacks, and grants Special cooldown charge +1 to unit per attack during combat (only highest value applied; does not stack).

Cooldown Count = 5
If unit initiates combat, when unit's Special triggers, grants another action to unit after combat (once per turn).
If unit initiates combat, reduces damage from foe's attacks by 40% during combat (excluding area-of-effect Specials).

Enables 【Canto (2)】.
If unit initiates combat or is within 2 spaces of an ally, grants Atk/Spd+8 to unit, unit deals +X damage (excluding area-of-effect Specials), and reduces damage from foe's first attack by X during combat (X = number of allies within 3 rows or 3 columns centered on unit x 2, + 2; max 8; "first attack" normally means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes).

If unit initiates combat or is within 2 spaces of an ally, inflicts Spd/Def-4 on foe, deals damage = 20% of the greater of unit's Spd or Def (excluding area-of-effect Specials), and reduces the percentage of foe's non-Special "reduce damage by X%" skills by 50% during combat (excluding area-of-effect Specials), and also, if decreasing the Spd difference necessary to make a follow-up attack by 25 would allow unit to trigger a follow-up attack (excluding guaranteed or prevented follow-ups), triggers 【Potent Follow X%】 during combat (if unit cannot perform follow-up and attack twice, X = 80; otherwise, X = 40).

At start of turn, if unit is within 2 spaces of an ally, grants Atk/Spd+6 and "neutralizes foe's bonuses during combat" to unit and allies within 2 spaces of unit for 1 turn.
Grants bonus to unit's Atk/Spd = number of allies on the map with the "neutralizes foe's bonuses during combat" status effect active + 2 (excluding unit; max 5) and deals damage = number of spaces from start position to end position of whoever initiated combat × 2 during combat (max 8; excluding area-of-effect Specials).

Ferox Fir's Harmonized Skill Effect

Harmonized Skill
Grants 【Resonance: Blades】 to unit and allies from the same titles as unit for 1 turn and grants Special cooldown count-2 to unit and allies from the same titles as unit.
Any effect that can be triggered only once per turn by unit's equipped Special skill can be triggered again if that effect has already been triggered (excludes boosted Special effects from engaging).
(Harmonized Skills can be used by tapping the Harmonized button. Harmonized Skills cannot be used by units deployed using Pair Up.)

Resonance Effect

The Binding Blade / The Blazing Blade
Increases scores in Resonant Battles.

Ferox Fir Best IVs

Recommended IVs

Stat Superboon/Superbane IV Recommendation
HP (18) HP Superbane ★★★☆☆
Atk (11) No Attack IV ★★★★☆
Spd (10) Spd Boon ★★★★★
Def (9) No Def IV ★★★☆☆
Res (6) 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.

+Spd / -Res

The best IVs for Ferox Fir are +Spd and -Res. Ferox Fir's base 49 Spd, raised to 53 with a superboon, is among the highest in the game. This allows her to outspeed her foes and generate follow-up attacks while also preventing follow-up attacks against other speedy foes.

With how hard Ferox Fir can attack using her uncapped true damage, boosting Spd to generate follow-up attacks is the best use of her IVs.

Res is Ferox Fir's least important stat and can be safely taken as a bane as it won't impact any of her matchups.

+Spd for a +10 merge

We recommend +Spd when merging Ferox Fir up to +10 to ensure she retains her Spd edge against the metagame.

Ferox Fir Best Builds

Offensive Ferox Fir

HOT
Attuned Skill IconSly Echo
Updated on 09/05/2025

How to Use, Explanation

Ferox Fir makes great use of Emblem Sigurd ring despite it being somewhat redundant with Blue Skies 4, mostly for its increased movement effect. The rest of her kit is geared towards maximum damage.

Source Heroes for All Skills

Ferox Fir Stats

Stat Rankings

Neutral Stats at Lv. 40 (5★)
195
HP
HP 40 40
Rank: 541/1322
Atk
Atk 46 46
Rank: 107/1322
Spd
Spd 49 49
Rank: 1/1322
Def
Def 35 35
Rank: 290/1322
Res
Res 25 25
Rank: 753/1322

Stat Values

Lv 40+10 Stats (5★)

HP Atk Spd Def Res Total
+10 Merges W/ Skill Bonuses 45 67 54 39 29 234
Lv.40 +10 45 51 54 39 29 218

HP Atk Spd Def Res Total
+HP
Lv.40 +10
47 50 53 39 29 218
+Atk
Lv.40 +10
44 53 53 39 29 218
+Spd
Lv.40 +10
44 50 57 39 29 219
+Def
Lv.40 +10
44 50 53 42 29 218
+Res
Lv.40 +10
44 50 53 39 33 219

Stats at Lv 40

HP Atk Spd Def Res Total
5★- Adjusted for Skills 40 62 49 35 25 211
5★ Lv.40 40 46 49 35 25 195

Initial Stats (with Skills)

HP Atk Spd Def Res Total
5★ Lv.1 18 27 10 9 6 70

Stat Comparison of Similar Heroes

Hero
HP
Atk
Spd
Def
Res
Total
Ferox Fir Icon Ferox Fir
40 46 49 35 25 195
40 45 48 32 25 190
41 49 47 34 19 190
39 45 47 36 23 190
40 45 45 37 18 185
41 42 47 30 24 184
41 45 46 30 22 184
40 46 45 30 18 179
40 44 46 32 17 179
41 45 46 29 18 179
39 45 46 29 20 179
40 43 41 37 18 179
40 39 42 27 25 173
38 36 40 30 24 168
41 41 17 37 26 162
41 34 35 31 16 157
38 32 34 26 24 154

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

Ferox Fir Roles, Strengths, and Weaknesses

Ferox Fir Roles

Fir - Dual Warriors 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 Duo and Harmonized ImageDuo /
Harmonized
No Resplendent ImageResplendent

Ferox Fir is a close physical 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 Def stat.

Ferox Fir Strengths

Princesses' Edge grants uncapped bonus true damage

Ferox's Fir's exclusive weapon Princesses' Edge grants multiple effects that heavily swing combat in her favor. Below is a table of these effects:

Condition(s) Effect
Always Accelerates Special trigger (cooldown count-1)
At start of turn Grants Special cooldown count -2 to Ferox Fir
At start of turn and after unit acts Inflicts Spd/Def-7, 【Discord】,【Spd Shackle】, and 【Def Shackle】 on closest foes and foes within 2 spaces of those foes
Ferox Fir initiates combat
OR
Ferox Fir is within 2 spaces of an ally
Grants Ferox Fir up to Atk/Spd/Def/Res+14 (based on allies within 3 rows or 3 columns)
Ferox Fir initiates combat
OR
Ferox Fir is within 2 spaces of an ally
Grants Ferox Fir bonus true damage equal to thrice the number of non-stat Bonus and Penalty effects active on target foe and foes within 2 spaces of target
Ferox Fir initiates combat
OR
Ferox Fir is within 2 spaces of an ally
Grants Ferox Fir bonus true damage reduction equal to 20% of her Spd
Ferox Fir initiates combat
OR
Ferox Fir is within 2 spaces of an ally
Grants Ferox Fir a Null Follow-Up effect
Ferox Fir initiates combat
OR
Ferox Fir is within 2 spaces of an ally
Grants Ferox Fir Special cooldown charge +1 per attack

The bonus true damage effect from Princesses' Edge is uncapped. This means that more and more true damage can be added into each attack as more Bonuses and Penalties are applied.

In today's metagame, stacking Bonus and Penalty effects is very common, with units having around 7 to 10 effects active quite often. It is not absurd to have Ferox Fir hitting just as hard as, if not even harder than Young Camilla, who was the premiere nuke unit in the game before Fir's release.

Harmonized Skill allow second triggers

Ferox Fir's Harmonized Skill grants 【Resonance: Blades】 and Special cooldown count -2 to Ferox Fir and allies from similar titles.

Additionally, any effect that can be triggered only once per turn by unit's equipped Special skill can be triggered again if that effect has already been triggered. This includes effects like the once-per-turn 40% damage reduction effect on various Specials like Armored Blaze, or more notably, Galeforce and Galeforce Mist.

Timing is key when using this Harmonized Skill. Players need to use this before actually triggering the Special skill in order for the effect to trigger a second time.

Ferox Fir Weaknesses

Weak to Cavalry Effective Weapons

Ferox Fir 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!

Heroes with Effective Skills

Should you Unlock Potential?

Should You Unlock Potential for this Hero? Cannot Unlock Potential

Fir - Dual Warriors Only Appears as a 5 Star Hero!

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

Unlock Potential Tier List

Ferox Fir - 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 Accelerates Special trigger (cooldown count-1).
At start of turn, grants Special cooldown count-2 to unit.
At start of turn and after unit acts (if Canto triggers, after Canto), inflicts Spd/Def-7, 【Discord】,【Spd Shackle】, and 【Def Shackle】 on closest foes and foes within 2 spaces of those foes through their next actions.
If unit initiates combat or is within 2 spaces of an ally, grants bonus to unit's Atk/Spd/Def/Res = number of allies within 3 rows or 3 columns centered on unit × 3, + 5 (max 14), unit deals +X × 3 damage (excluding area-of-effect Specials; X = number of Bonus effects and Penalty effects active on target and foes within 2 spaces of target, excluding stat bonuses and stat penalties), reduces damage from foe's attacks by 20% of unit's Spd (excluding area- of-effect Specials), neutralizes effects that guarantee foe's follow-up attacks and effects that prevent unit's follow-up attacks, and grants Special cooldown charge +1 to unit per attack during combat (only highest value applied; does not stack).
5★

Assists

This Hero has no Assist skills that can be learned.

Specials

Skill Name Effect Learned At
(Cooldown Count = 3) Boosts damage dealt by 50%. 5★
(Cooldown Count = 4) Boosts damage dealt by 150%. 5★
(Cooldown Count = 5) If unit initiates combat, when unit's Special triggers, grants another action to unit after combat (once per turn).
If unit initiates combat, reduces damage from foe's attacks by 40% during combat (excluding area-of-effect Specials).
5★

Passives

Skill Name Effect Learned At
If unit initiates combat or is within 2 spaces of an ally, grants Atk/Spd+2 to unit, unit deals +X damage (excluding area-of-effect Specials), and reduces damage from foe's first attack by X during combat (X = number of allies within 3 rows or 3 columns centered on unit; max 2; "first attack" normally means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes). 5★
If unit initiates combat or is within 2 spaces of an ally, grants Atk/Spd+4 to unit, unit deals +X damage (excluding area-of-effect Specials), and reduces damage from foe's first attack by X during combat (X = number of allies within 3 rows or 3 columns centered on unit × 2; max 4; "first attack" normally means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes). 5★
If unit initiates combat or is within 2 spaces of an ally, grants Atk/Spd+6 to unit, unit deals +X damage (excluding area-of-effect Specials), and reduces damage from foe's first attack by X during combat (X = number of allies within 3 rows or 3 columns centered on unit × 2; max 6; "first attack" normally means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes). 5★
Enables 【Canto (2)】.
If unit initiates combat or is within 2 spaces of an ally, grants Atk/Spd+8 to unit, unit deals +X damage (excluding area-of-effect Specials), and reduces damage from foe's first attack by X during combat (X = number of allies within 3 rows or 3 columns centered on unit x 2, + 2; max 8; "first attack" normally means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes).
5★
At start of combat, if unit's HP = 100% and unit initiates combat, neutralizes effects that prevent unit's follow-up attacks and restores 5 HP to unit after combat. 5★
At start of combat, if unit's HP ≥ 50% and unit initiates combat, neutralizes effects that prevent unit's follow-up attacks and restores 7 HP to unit after combat. 5★
If unit initiates combat, neutralizes effects that prevent unit's follow-up attacks and restores 10 HP to unit after combat. 5★
If unit initiates combat or is within 2 spaces of an ally, inflicts Spd/Def-4 on foe, deals damage = 20% of the greater of unit's Spd or Def (excluding area-of-effect Specials), and reduces the percentage of foe's non-Special "reduce damage by X%" skills by 50% during combat (excluding area-of-effect Specials), and also, if decreasing the Spd difference necessary to make a follow-up attack by 25 would allow unit to trigger a follow-up attack (excluding guaranteed or prevented follow-ups), triggers 【Potent Follow X%】 during combat (if unit cannot perform follow-up and attack twice, X = 80; otherwise, X = 40). 5★
At start of turn, grants Spd+2 to adjacent allies for 1 turn. 5★
At start of turn, grants Spd+3 to adjacent allies for 1 turn. 5★
At start of turn, grants Spd+4 to adjacent allies for 1 turn. 5★
At start of turn, if unit is within 2 spaces of an ally, grants Atk/Spd+6 and "neutralizes foe's bonuses during combat" to unit and allies within 2 spaces of unit for 1 turn.
Grants bonus to unit's Atk/Spd = number of allies on the map with the "neutralizes foe's bonuses during combat" status effect active + 2 (excluding unit; max 5) and deals damage = number of spaces from start position to end position of whoever initiated combat × 2 during combat (max 8; excluding area-of-effect Specials).
5★

Ferox Fir as a Source Hero

Ferox Fir Avatar

Value of Skills ★★★★★

Ferox Fir has Galeforce Mist, Blue Skies 4, Potent Assault, and A/S Outcry Dull as inheritable options.

Prioritize Galeforce Mist and either Blue Skies 4 or Potent Assault when using Fir for inheritance. However, Fir is a very strong hero. Consider keeping her for your barracks.

List of Source Heroes The Best Fodder Units

Community Feedback

How would you rate Ferox Fir?

Top tier hero. Must summon. 14
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Summon if you need his/her hero archetype. 0
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Summon if you like this hero. 0
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Summon for his/her Skill Inheritance options. 0
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If you have feedback about this hero page, let us know in the comments section below!

How to Get Ferox Fir / Illustrations / Voice Actor / Quotes

How to Get Ferox Fir

Obtained through a Special Summoning Event!

Ferox Fir 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)
Liv Strander with Allegra Clark
Illustrator Gesoking
Appears In

Illustration

FEH: Related Guides

Special Heroes: Beside Kin

Beside Kin Banner

Heroes from Special Heroes - Beside Kin
Ferox Fir IconFerox Fir
[9.9/10]
Ferox Marth IconFerox Marth
[9.5/10]
Ferox Chulainn IconFerox Chulainn
[8.5/10]
Ferox Chrom IconFerox Chrom
[9.5/10]

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