Fire Emblem Heroes Wiki:Build Center/Fir: Sword Student

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Quick Hero Info
Type
Icon Move Infantry.png Icon Class Red Sword.png
Stats
41 / 25 / 36 / 24 / 31
Exclusive skills

Dueling Sword.png Optimal
Build Icon Allpurpose.png All-purpose
Orb.png Very high investment
Face my Blade!
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Fir becomes a potent force with her new weapon.

This build leverages the power of Icon Class Red Sword.png Nameless Blade being Wo Dao+ and Icon Class Red Sword.png Slaying Edge+ on the same weapon to use flat damage increases to compensate for Fir's poor attack stat while leveraging her decent defenses to be able to tank a hit.

The ideal boon for Fir is +Atk, as it is a superboon patching up her base attack a more acceptable 29. Her ideal bane takes is -Def or -HP, which slightly hurts her tankiness but keeps her ability to ploy. If one chooses not to run a ploy -Res is also acceptable.

Icon Class Red Sword.png Nameless Blade makes this build, as it allows Fir to patch up her abysmal attack by giving her a flat +10 damage every special attack, and giving her the minus cooldown effect so she can activate her special basically every combat.

Icon Skill Assist.png Reposition is generically one of the strongest assist skill, allowing Fir to move her allies behind her so she can tank the hit and then activate a special against them. However, other assist skills also work fine.

Icon Skill Special.png Moonbow is the best special for her given its low cooldown to synergize with the damage boost from Icon Class Red Sword.png Nameless Blade. When baiting she will immediately activate the skill, allowing her to dish out serious damage. Icon Skill Special.png Moonbow performs slightly better than Glimmer due to the latter not scaling off of the flat damage increases and thus being less effective due to Fir's low base attack, but either can work well.

Distant Counter allows Fir to leverage her good res bulk to bait mages in and then blow them up. Her defensive stats otherwise are decent enough to allow her to fight melee units. Due to her naturally high speed she usually will not get doubled by Melee units and due to her decent physical bulk generally isn't liable to getting OHKO'd unless running into brave weapons.

Wrath 3.png Wrath 3 is by far her strongest B skill. Because Icon Class Red Sword.png Nameless Blade already gives you the incentive to run a low cooldown special, Wrath can add an extra layer of damage and utility to Fir. When baiting the enemy in her snap back will do +20 flat damage, and then on her next player phase the cooldown effect will activate giving Fir an instant special to take out a second enemy. This is essential for letting her curb her otherwise poor attack stat and gives her a lot of killing power.

Def Ploy 3.png Def Ploy 3 is a very solid C skill for Fir given her naturally high res. While it will not activate on res tanks, she will generally be able to OHKO them anyways due most mages having bad defense. This provides her with about 5 extra attack on enemies, in addition to letting her support her allies.

Alternately, any Hone/Spur/Tactic can be run in her C slot.

Quick Riposte 3 is the best seal for her, as it allows her to better duel tanky bruiser units by allowing her to always double on her first combat. This is especially important because the boon and weapon choice leaves her without much extra speed, making her speed tier okay for avoiding getting doubled but almost never enough to double enemies back.
Build Icon Alternative.png Alternative
Build Icon Allpurpose.png All-purpose
Universal Crystal.png Medium investment
Face my Budget!
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Fir becomes a potent force with her new weapon.

This build aims to leverage Icon Class Red Sword.png Nameless Blade on a budget by turning Fir into a close range duelist that can rely on fast Wo Dao activations in order to quickly output damage.

The ideal boon for Fir is +Atk, as it is a superboon patching up her base attack a more acceptable 29. Because you are running Fury 3, Fir will generally have more than enough resistance to ploy the targets that she needs to ploy. In addition, because you are focusing on melee matchups, and her resistance is already very high, -Res lets Fir have better times against otherwise marginal matchups.

Icon Class Red Sword.png Nameless Blade makes this build, as it allows Fir to patch up her abysmal attack by giving her a flat +10 damage every special attack, and giving her the minus cooldown effect so she can activate her special basically every combat.

Icon Skill Assist.png Reposition is generically one of the strongest assist skill, allowing Fir to move her allies behind her so she can tank the hit and then activate a special against them. However, other assist skills also work fine.

Icon Skill Special.png Moonbow is the best special for her given its low cooldown to synergize with the damage boost from Icon Class Red Sword.png Nameless Blade. When baiting she will immediately activate the skill, and with Wrath 3.png Wrath 3 she will immediately have it up for the next combat. Icon Skill Special.png Moonbow performs slightly better than Glimmer due to the latter not scaling off of the flat damage increases and thus being less effective due to Fir's low base attack, but either can work well.

Fury 4.png Fury 4 provides a cheap, effective way to increase Fir's bulk while also increasing her damage output. With it she can better duel melee units with only a small drawback.

Quick Riposte 2.png Quick Riposte 2 allows Fir to better duel tanky bruiser units by allowing her to always double on her first combat. This is especially important because the boon and weapon choice leaves her without much extra speed, making her speed tier okay for avoiding getting doubled but almost never enough to double enemies back.

Guard 3 is also a very strong skill on Fir, letting her initiate freely on dragons and punishing armor units reliant on specials. Another choice for a B skill is Swordbreaker 3.png Swordbreaker 3 or some other breaker. This allows Fir to diversify the threats she can check, but at the price of having slightly worse matchups overall.

Def Ploy 3.png Def Ploy 3 is a very solid C skill for Fir given her naturally high res. While it will not activate on res tanks, she will generally be able to OHKO them anyways due most mages having bad defense. This provides her with about 5 extra attack on enemies, in addition to letting her support her allies.

If that is too expensive, and Hone/Spur/Tactic also works well with her.

If Fir runs Quick Riposte 2.png Quick Riposte 2 then Close Def 3.png Close Def 3 becomes the best seal for her. Due to not having access to Distant Counter it is best to shore up her melee matchups, which Close Def 3.png Close Def 3 is very adept at.

If Fir runs a breaker as her B, then Quick Riposte 3 becomes the best seal for her, as having a source to reliably double initiated upon is important.
Dueling Sword.png Optimal
Dueling Crest.png Arena
Orb.png Very high investment
EP Glacies Nuker
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With the addition of Nameless Blade, Fir now has more destructive Glacies potential than ever before. This build is focused more on Enemy Phase. +ATK is an absolute MUST in the boon category, as it is a superboon, and really helps patch up her pitiful 25 ATK to an almost respectable 29. The -1 cooldown on Nameless Blade brings Glacies down to a cooldown time of 3, and with Warding Breath granting her an extra cooldown point upon being attacked, she'll be able to proc Glacies on any enemy she can double. (Unless they have Guard). The combination of Warding Breath, and the Close Defense seal will boost her RES by an additional 10 points, already adding to her deadly Glacies hits. The Wo Dao effect refinement for Nameless Blade is very important here, as, when combined with Wrath, grants another 20 flat damage to her Glacies hits. Def Ploy is useful to reduce the Def of enemies on her less spectacular player phase, just overall letting her do more damage. A good budget option would be Threaten Def. If your Fir has an HP bane, you can use Ardent Sacrifice once to get into Wrath range, so that's a useful skill. Otherwise, Reposition is always good. Close Defense 3 on the enemy phase will help her shaky defenses a little bit, but you'll likely still need to keep a healer nearby. With weapon triangle advantage, she reaches 116 ATK on her Glacies hits before the enemy's DEF is taken into consideration. She can also do just enough damage to kill a neutral ivs Lukas with Fortress Def 3, so she won't just be limited to killing reds and greens.
Dueling Sword.png Optimal
Dueling Crest.png Arena
Hero Feather Darkened.png High investment
Icon Move Infantry.png Infantry
The Path of Wrath
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Purely player phase thighs, I mean Fir. With the addition of the Nameless Blade also known as the super Wo Dao to the game, Fir can pretty much destroy every enemy with a high powered special. This build capitalizes on the Stacked additional damage from the Super Wo Dao and Wrath. By getting into Wrath range through Ardent Sacrifice, Fir can stack three charges (Accelerated cooldown, Wrath, and Quickened Pulse) before she even engages in her first battle, meaning that she can use a SUPER Icon Skill Special.png Iceberg on the opponent, making her a lethal force.

PREFACE: Wind Blessing is the best on Fir because it both increases Iceberg's damage as well as helping her trigger Def Ploy more often.

Weapon: THE SUPER WO DAO has a unique niche (Extra damage as well as acceleration of special) that is unavailable to every other hero in the game, barring Fir and her uncle, Xiahou Dun (Karel). While Icon Class Green Axe.png Hauteclere has the same effect, Minerva and Michalis are both Fliers meaning they don't have access to Wrath. Only Fir and Karel can stack Wrath and extra damage, while getting an accelerated cooldown for free. It is an amazing asset she has.

Assist: With -HP IV, Fir has less than 40 HP meaning that she can use Icon Skill Assist.png Ardent Sacrifice to get into Wrath range. Reposition is another option that is useful for movement.

Special: Icon Skill Special.png Iceberg is very powerful because of of Fir's rather high Resistance. It has very good synergy with Quickened Pulse because the extra charge gives her the opportunity to use it immediately. Glimmer is another option that notably works very well with Atk Tactic 3.png Atk Tactic 3 Support. Icon Skill Special.png Moonbow and Icon Skill Special.png Luna are inferior options for Fir because they don't scale very well due to Fir's meager Attack.

A: Brazen Atk Def 3.png Brazen Atk/Def 3 has great synergy with Wrath and Ardent Sacrifice. It gives Fir the extra attack power she requires to break through opponents. A defensive buff is more valuable than a speed buff because Fir doesn't need to follow-up to do damage. She gets most of her damage by using her special on her first attack. Death Blow 3.png Death Blow 3 is a budget option that gives one point less of attack power.

B: Wrath 3.png Wrath 3 is the cornerstone of this build. It charges up her special faster and helps her do more damage, which she sorely appreciates.

C: Fir's high Resistance allows her to use ploys effectively. Def Ploy helps her do more damage. She can also run support skills like Atk Tactic or Def Tactic.

Seal: Quickened Pulse.png Quickened Pulse is a necessity if using Icon Skill Special.png Iceberg. IF she's using Icon Skill Special.png Glimmer, then Attack +3 helps her do a bit more damage.
Dueling Sword.png Optimal
Build Icon Allpurpose.png All-purpose
Hero Feather Darkened.png High investment
Icon Move Infantry.png Infantry
Iceberg Tempest
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This build was made to make Fir a little Ayra, which relies on a 2 attack cd special and hers high speed to double almost any opponent and manage to use Iceberg on any given double attack. Strongly recomand to have +Spd IV because of this reason, but even +Res might be good. Personally I gave Fir anything i could: Summoner Support, Water type God Gift (for speed), and I leveled up the Killing Edge+ to Slaying Edge+ (strongly racomand) and leveled that up for increased Res. My Fir 5 Star Lvl 40+1 has 52 PS, 38 Atk, 42 Spd, 26 Def and 37 Res, without Unit support and God's Gift increased Spd. She can tank up any mage assoult but Reinheart with Quick Pulse, than oneshot any given Unit with less than 40 HP and 25 Def, even Spears. If we exclude Spears she can take down even 30 Def and 45 HP Red Units. If you manage to take full advantage of the 2 Ploys (Atk and Def) you can actually Duel almost anyone with some support (such as Azura or simply a Healer).
Dueling Sword.png Optimal
Build Icon Allpurpose.png All-purpose
Hero Feather Darkened.png High investment
Fir, Herself
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With the release of the Nameless Blade in 2.4, Fir suddenly becomes a viable damage unit with many good build possibilities. Rather than scrap all the hard work I made on my build prior to this update, I'll simply modify it to show a way to build her that doesn't focus purely on Attack. IVs are rather flexible here as they don't vary the results that significantly. +Spd/-Res might be the best combination though. While the previous build of Res-refined Slaying Edge+ could be made strong (especially defensively), the Nameless blade is unquestionably stronger/better on its own and allows Fir to do better when initiating combat. Use the Special refine and now it's a Wo Dao and a Killing/Slaying Edge in one. Like before, I'll cover both offensive and defensive takes on this build.

As with most melee units, you want Reposition to get whoever you're saving behind you.

For our special, we can go with Glacies, dropped to 3 turn CD thanks to the Nameless Blade. This is further helped by Flashing Blade 3 building charge every attack so long as she's at least 1 point higher in Spd, which she will be against the vast majority of foes. Due to this combo, Fir can often get her special to trigger on doubles if she's countered (provided the enemy doesn't have Guard). For a more defensive style of play, you'll want Warding Breath as your A Passive which accelerates her special when she's attacked rather than when she attacks. It also strengthens her special by 4. If going this route, you'll get more out of Iceberg as your special since Glacies doesn't activate as often without Flashing Blade's help.

That brings us to Wrath... This is another chance to bring about her Special faster when she's hurt, such as getting attacked on the enemy phase. The real boon here though is the +10 damage on specials, stacking with the +10 you already received from the refine on the Nameless Blade. As Wrath can be difficult to obtain (only available on a single 5-star unit), Vantage can also be a viable option. You won't kill as many enemies due to the damage decrease on specials, but the drop off isn't TOO bad, and you might be able to clean up units that would otherwise finish you off on the enemy phase.

C Passive has a lot of options that should be molded to what you need for her place in your team. If her role is more to support better damage-dealers, a buff would work well here. Otherwise, a Ploy would be a nice option.

Speed +3 is the ideal seal here as it helps activation of Flashing Blade and chances of doubling. If not using Flashing Blade, you may consider Quick Riposte (especially if your boon is already Speed).

These are my Mass Duel sim tests for Offense and Defense. In the "Offense" tests, assume Fir imitated, the enemy attacked back on their turn, and if both are still alive, Fir initiates again and so on. For "Defense", assume this sequence begins with the enemy initiating.

Glacies/Flashing Blade: (Offense): 189-44

Iceberg/Warding Breath: (Offense): 177-56

Glacies/Flashing Blade: (Defense): 193-40

Iceberg/Warding Breath: (Defense): 220-13
Dueling Sword.png Optimal
Build Icon Allpurpose.png All-purpose
Hero Feather Darkened.png High investment
Mix defense Set
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This build want to use the possibility of mix bulk of fir. At 5* w/ +def-res iv's she can get the same def and res stat and keep her hp, spd and atk at neutral. Since she can appear at 3* rarity merge is pretty easy on her and she can reach 35def/res w/ that iv's spread at +10 merge and reach 41 against melee unit during ennemis phase. since she gonna take some hit + the fury damage she can reach wrath range pretty easly and then charge up her 3turn Glacies and then hit for 50 to 70 damage w/ her special def ploy is her to do some damage on high def unit and then finish them off w/ glacies she can survive blue unit and kill them w/ glacies w/ that build but probably only after some merges that build is a really expenssive since he work well on +10 fir but it's pretty fun and if you run it in a mix emblem team w/ the def/res tactic combo she can just reach skyhigh def/res and benefit from her spd to charge glacies and kill. Since Saias is now live and can inherite spd ploy at 4* you can use spd ploy to deal w/ really fast unit like ayra for exemple pretty easly.