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Analysis by accidentalgreed
Múspell - Flame God

5

Obtainable as a 5 only

Hero Stats

Max Avg Total Stats at Lvl 40
173
HP 40
ATK 41
SPD 16
DEF 39
RES 37

Stat Variations

Level 1 Stat Variation
5★
HP ATK SPD DEF RES
Low 17 10 2 8 8
Middle 18 11 3 9 9
High 19 12 4 10 10

Level 40 Stat Variations
5★
HP ATK SPD DEF RES
Low 36 38 12 36 34
Middle 40 41 16 39 37
High 43 45 19 43 40

IV Sets

Key stats worth increasing through nature if possible.
Complementary stats that matter, but not to the point of picking them over key stats for nature increase.
Relatively worthless stat that can safely be decreased through nature.
HPATKSPDDEFRES

Skill Sets

Fire Emblem Heroes Featuring not Mondo Oowada from Danganronpa (Aether Raids Offense / General-Use Solo Tank)

Build by accidentalgreed
Recommended
Blackfire Breath+ (+Res)
Alternate: Flamelick Breath
A Distant Counter
Positional Assist B Dragon Wall 3
Alternate: Dragon's Ire 3
Bonfire
Alternate: Sol
C Domain of Flame
IVs

+ATK or +RES / -SPD

SQuick Riposte 3
Alternate: Atk/Res Solo 3

Show Explanation/Analysis

Weapon: Flamelick Breath / Blackfire Breath+ (+Res) \

Assist: Positional Assist

Special: Bonfire / Sol / Iceberg / Glimmer / Noontime

Passive A: Distant Counter / Distant Ward

Passive B: Dragon Wall / Dragon's Ire

Passive C: Domain of Flame

Sacred Seal: Quick Riposte / Atk/Res Solo / Mirror Stance / Mystic Boost / Atk/Def Solo / Stance equivalents of listed skills

  • Múspell can easily play the part of a dedicated tank (especially in Aether Raids Offense) thanks to his fantastic distribution in all categories but Speed. Múspell will be doubled frequently, however, meaning a lot of emphases will be placed on his single-shot damage and ability to take multiple rounds of hits. 
  • Much of Múspell's base skills fortunately already fulfill much of the build's goals:
    • Dragon Wall scales well off of Múspell's base Resistance on top of additional investment through skills and Mythic blessings. In most cases, Múspell will probably fulfill its maximum conditions, granting up to 40% total damage reduction and practically making all but the most powerful effective weapons bounce off of him.
    • Domain of Flame grants additional forms of damage through Atk/Def +4 and further true damage based on his Attack minus the enemy's Resistance. Assuming Múspell isn't facing off a total magic sponge, this part of the skill should hold true for the majority of common targets, giving Múspell a self-sufficient source of damage (excluding any additional support he's getting from other allies!).
  • Awkward as it may be to totally replace Muspell's unique Breath weapon, Blackfire Breath is worth a very considerable amount of thought. While Flamelick Breath boasts better raw Attack and Fatal Smoke built-in, a lot of its effectiveness is lost upon going below 25% HP, and besides this, its【Deep Wounds】 isn't particularly urgent to have on an Aether Raids Offense tank.
    • Meanwhile, in exchange for just some Attack, Blackfire Breath's stat swings and enemy bonus negation are consistent at any health level as long as Múspell is separated from his allies. Thanks to Múspell's enhanced movement, it is easy in practice to abide by this while benefiting from ally skills like Drive Atk or Distant Guard from a space away.
    • Additionally, Blackfire Breath is refineable, meaning Múspell technically gains superior defensive performance thanks to increased +5 HP and a defensive refine. With a +RES refine and Blackfire Breath's built-in Lull skill (the enemy's Attack and Resistance take a pretty deep dive of -5), it synergizes almost superiorly well with Dragon Wall, too
  • Given how rare Blackfire Breath is, though (it's a seasonal weapon on fellow red Dragon Halloween Dheginsea), Flamelick Breath is a perfectly doable base tool that bolsters Múspell's statline in all categories +5 except HP — the Fatal Smoke and +3 Atk on top of 16 Might are also handy to disable any sources of enemy healing (especially Healing Tower if Múspell initiates into a group of enemies with ideal positioning) as well being his best raw damage-dealing option. 
  • The only urgent inheritance needed here is Distant Counter, a basic requirement for any sole omnitank to maximize counterattacking options. 
    • Though far less recommended than normal Distant Counter, Distant Ward is worth looking into if making Múspell a dedicated magic tank with a secondary Near Save ally seems is a priority strategy for you.   
  • Múspell's natural inability to make follow-up attacks takes up a few considerations:
    • You can run Dragon's Ire in the B slot or Quick Riposte as the Sacred Seal to create follow-up opportunities for Múspell and lower the possibility of enemy survival due to two attacks. Running either comes at the cost of some rather nifty skills in those slots, though, and you'll probably need to provide equivalent effects through other allies' support skills (like Flayn's Caduceus Staff). 
    • Lacking an immediate method of cooldown acceleration and generally being guaranteed to get doubled means Bonfire (or Iceberg if Múspell's Resistance is at a higher number) or Sol are Múspell's best Special choices due to reasonable cooldown and activation returns. 
      • If you DO happen to have some special form of Special cooldown charging like Summer Hilda's Sunshade Staff, however, Glimmer and Noontime are immediately preferred for instant activation on every counterattack. 
  • As far as seals are concerned, Atk/Res Solo has been mentioned shortly before as a great damage and magical resilience padder, and it pairs well with the Resistance-scaling Dragon Wall and the also-Solo-activated Blackfire Breath. You may run a variety of similar alternatives to it, or to Atk/Def Solo if you prefer more physical resilience. Without a healing Special, Mystic Boost is also worth mentioning for some form of sustain, though a properly-built Offense team can possibly mean Múspell won't need it the majority of the time

Dragalia Lost Prometheus but Gonkier (Melee Specialist / Far Save Carry Partner)

Build by accidentalgreed
Recommended
Flamelick Breath
Alternate: Pale Breath+ (+Def)
A Atk/Def Unity
Alternate: Close Def 4
Positional Assist B Dragon Wall 3
Alternate: Dragon's Ire 3
Bonfire
Alternate: Glimmer
C Domain of Flame
IVs

+DEF or +ATK / -SPD

SQuick Riposte 3
Alternate: Sturdy Stance 2

Show Explanation/Analysis

Weapon: Flamelick Breath / Pale Breath+ (+Def) / Blackfire Breath+ (+Def)

Assist: Positional Assist

Special: Glimmer / Bonfire

Passive A: Atk/Def Unity / Close Def 4 / Atk/Def Catch / Sturdy Stance / Atk/Def Bond 

Passive B: Dragon Wall / A/D Near Trace / Dragon's Ire

Passive C: Domain of Flame

Sacred Seal: Quick Riposte / Atk/Def Solo / Sturdy Stance

  • When utilized alongside an armored carry unit utilizing a Far Save skill, Múspell can run a very effective variant of the previous build that's specifically focused on investing in melee combat performance. While his fellow Far Save ally handles all ranged combat, Múspell can utilize Domain of Flame to significantly strengthen said ally as well as himself. 
  • As a side note, Múspell's Resistance is also great enough that stray dragon attacks aren't a particularly high concern (don't get cocky versus Seiros, though) and he can make typically full mileage out of Dragon Wall's damage reduction against most common Defense attackers.
  • The main change here is the transition from Distant Counter to a stats-boosting A-slot passive skill, allowing Múspell to prime himself better for raw combat rather than ranged counterattacking. 
    • Atk/Def Unity synergizes well with the nearness required of Múspell's Far Save ally and provides protection versus penalties. 
    • Close Def doesn't improve Múspell's raw damage but prepares him better versus dragonstone enemies while providing a pseudo-Lull skill effect (that is, cancelling enemy buffs). 
    • Other Atk/Def skill equivalents are up in the air if you can access them. The most notable are Atk/Def Catch — which technically provides one of the highest Atk/Def boosts of +9 if you abide by both of its conditions — and Sturdy Stance 3 — whose Guard effect will always be handy versus enemies with short charged Specials. 
  • To ensure a greater chance of killing melee enemies in one sitting, a follow-up skill is required one way or another. This is done through Quick Riposte in the Sacred Seal, or the more effective and longer-lasting Dragon's Ire if you're willing to make a fair trade for the utility of other B-slot skills. 
  • Speaking of B-slots, A/D Near Trace is a third alternative to Dragon Wall and Dragon's Ire before it. It gets some nice usage in combination with Flamelick Breath's Deep Wounds】penalty spread as Múspell can initiate after Bolt Tower activates (thus disabling the enemy defenders from healing it back with their Healing Tower) and retreat back to the safety of his Far Save ally after combat. Use this only if you're confident in your ability to position both units before and after the fact. 
  • If you're not a fan of Flamelick Breath's limited longevity (that is, it's only really effective if Múspell keeps above 25% HP), Pale Breath and Blackfire Breath are great inheritable options to consider. Both provide technically superior combat boosts (+5 HP and +4 to whichever defense you choose, preferably Defense) while having no HP-related caveats. Note that Blackfire Breath requires Múspell to stay a space away from his Far Save ally, which is still favorable and not particularly difficult to achieve, but can be rather inconvenient in strained situations. 
  • Bonfire is a pretty great Special under the assumption Muspell will get doubled by most enemies he comes across and follows up with Quick Riposte or Dragon's Ire. If you have some source of cooldown acceleration (like Summer Hilda or New Year Velouria) for instant 2 CD retaliation, or simply don't want to take chances with timing, Glimmer is a short and reliable option. 

Volcano Top Cape with Da Fur (Aether Raids Defense & Offense / Support Build)

Build by accidentalgreed
Flamelick Breath A Atk/Def Unity
Alternate: AR-D Def/Res 4
Assistless
Alternate: Rally Up Atk+
B A/D Near Trace 3
Alternate: Dragon Wall 3
Glimmer
Alternate: Bonfire
C Domain of Flame
IVs

+DEF or +RES or +ATK / -SPD

SDrive Atk 2
Alternate: Close Guard 3

Show Explanation/Analysis

Weapon: Flamelick Breath

Assist: Assistless / Rally Up Atk+

Special: Glimmer / Bonfire

Passive A: Atk/Def Unity / Sturdy Stance 3 / Bracing Stance 3 / AR-D Atk/Def / AR-D Atk/Res / Death Blow / AR-D Def/Res 

Passive B: A/D Near Trace / Dragon Wall

Passive C: Domain of Flame

Sacred Seal: Distant Guard / Close Guard / Drive Atk / Various Spur Equivalents

  • Múspell can also run a build based off his intended design and purpose: an Aether Raids Defense defender. Keep in mind, however, that lacking good initiation options like high Speed, guaranteed follow-ups, or Impact skills may make him underperform a bit as an attacking unit; much of his AR-D utility instead stems from his ability to spread Deep Wounds】and power up nearby allies in early-turn formations with Domain of Flame. You may also simply run this build on Offense as a damage amplifier for other main attacker units of your choice. 
  • As a usage tip, if you have Bridal Catria/Thea available in your barracks, it's recommended to run Múspell with them on Aether Raids Defense as the duo can apply the【Triangle Attack】effect to him. This allows Múspell to attack twice (when other 【Triangle Attack】induced allies are near him) and thus overcome his otherwise unexceptional Player phase performance. Overall, this combination serves to significantly increase Múspell's overall offensive presence and serve as an unexpected initiation threat. 
  • Due to the joint supportive nature of Domain of Flame, it's generally a good idea to place priority around utilizing it rather than prime Múspell's combat. 
    • In addition to providing a basically free Atk/Def +4 to both Múspell and his surrounding defenders, Domain of Flame gives another potential form of damage: additional true based off of Múspell / an ally's Atk minus the enemy's Resistance. Provided you account for the second effect and build your formation so all defenders' Attack levels are fantastically high, this should prove to be a useful way to boost damage and physical bulk all around the team.
    • Another "within two spaces" skill in the Sacred Seal further contributes to Múspell's support utility. The easiest to recommend here is Drive Atk as it further enables Domain of Flame's true damage based on his ally's Atk minus the opponent's Resistance differential (translation: bing bong Drive Atk 10 hit hard). Close Guard or Distant Guard are secondly great they cover an allies' Defense and Resistance in melee or ranged combat, respectively. 
  • Flamelick Breath is pretty much a keeper and one of the other reasons you're running Múspell on your Aether Keep; the 【Deep Wounds】 penalty can be a gamechanger, especially when it's in weapon form and thus basically unblockable. It follows that Múspell's survival typically matters very little as the penalty applies as long as he gets in one attack. Needless to say, enemy superunits who rely on sustain to stick around will not appreciate the added healing obstruction.  
  • Going without an Assist skill is generally a good call in AR-D if you need to prioritize other allies moving or using their Rally assist before Múspell does. A more aggressive formation involving Múspell going first and spreading 【Deep Wounds】, however, may require Múspell to use his native Rally Up Atk+ so he rallies and gets Danced first.
  • A lack of Impact skills leaves Múspell a bit lost for actually useful A-slots, so it's generally best to seek skills that increase Múspell's initiation damage, bulk, or perhaps both. To prevent opposing Galeforce offense units from charging said special, you may also consider running a high-tier Stance skill as they come built with cooldown delay. 
  • The average layperson need not think too much about Múspell's B slot passive outside of his native Dragon Wall; its Resistance-based damage reduction is usually enough to delay Múspell's demise against all but the most Res-heavy units he initiates against. If you're able to access A/D Near Trace, however, its useful Canto effect (movement after combat) helps Múspell seek more favorable spaces after attacking and surviving, and the extra raw Attack debuff is always nifty. 

Strengths

Domain of Flame 

Say hello to Joint Drive Attack on some really, really hot steroids. Like the Joint Drive skill line, Domain of Flame's benefits apply on both Múspell and allies within a two space proximity, and said benefits are as follows:

  • It gives a simple, no-frills stat spur of Atk/Def +4, granting a superior double boost (compared to a normal Joint Drive) for Múspell and his ally's damage and physical bulk. 
  • It also provides additional true damage based on some of the difference between Múspell / his ally's Attack minus the enemy's Resistance. Assuming you abide by said condition, this further improves the sheer amount of damage done, and the icing on top is that the damage is basically unblockable.  

If nothing else, the fact that Domain of Flame is such a nice C skill means you don't have to think very hard about commonly-considered but expensive alternatives such as Pulse Smoke, Joint Drive Atk, and Fatal Smoke (the latter two of which are redundant as Múspell's kit already has them in some form). 

Flamelick Breath

For the extremely easy non-condition of merely performing at or above 25% HP, Múspell gets some quite neat perks on top of a dandy +3 Atk:

  • You can't really say no to a now-standard but handy +5 in-combat stat boost across the board. The Speed is a bit pointless, but extra Attack and defenses are always welcome to bolster Múspell's tankability.
  • The status Deep Wounds is built-in, allowing Múspell to apply healing blocks against his enemy and their surrounding allies. This is particularly deadly versus opponents with a single carry unit that relies on sustain, and is a solid auxiliary tool overall especially in Aether Raids Defense. It should be greatly emphasized that becauseDeep Wounds】is in a weapon and not a skill slot, it's actually unpreventable and will activate and spread regardless of whether Múspell dies in battle or not; all he needs to do is make a successful hit. 

Cavalry Dragon

Múspell has a rather rare status as a cavalry dragon unit, which has only been ventured by none other than his frozen-hearted counterpart, Nifl. Both parts of the package fortunately give him quite a few benefits that are sought after in good Aether Raids units:

  • Cavalry: An enhanced movement of three spaces gives Múspell plenty of room to close or widen the distance between him and his foe, something that's key in a turn-limited mode. Additionally, Múspell has the option of running the Near Trace or Lull skill lines should his build call for after-combat movement options (especially with lack of Galeforce) or total stat advantage, respectively. 
  • Dragon: Múspell gets the usual dragon perk of hitting most ranged units on their weaker defensive stat, and seeing as most Mages would prefer not getting hit physically, this should prove to be handy sometimes. Additionally, Dragon-exclusive skills such as his native Dragon Wall or Dragon's Ire are there to enhance his defensive options, and if he must pass up Flamelick Breath for any reason, Blackfire or Pale Breath are there for perfectly great combat-focused weapon alternatives. 

Great Defenses and Attack

Like the mighty volcano his design conveys to the point of being an annoyingly direct visual metaphor, Múspell's Attack and defenses leaves little to speculate: any hit that lands melt all but the most magically sturdy, and he can take just about many neutral hits before going down. With his base skills granting additional stats across the board, additional and unblockable damage, as well as a form of damage reduction, Múspell's statistical might is only amplified with little need to consider inheritance expenses

Weaknesses

Low Speed 

In exchange for solid stat distribution everywhere else, Múspell's almost-unusable combat Speed oddly betrays his fantastic raw bulk and movement options. As it stands, most competently fast opponents are easily able to make their doubles on him without being impeded in any way. 

Terrible Initiation / Lack of Great Follow-Up Manipulation

Unlike recent mighty glacier units like Summer Freyr and Zeke, Múspell can't quite escape his Speed problems with a weapon that grants automatic follow-ups — he has to resort to Dragon's Ire or Quick Riposte while possibly forgoing other extremely useful B or Sacred Seals skills.

Additionally, no follow-up skills exist for his archetype in player phase, leaving Múspell largely reliant on single-hit damage when initiating. Moreover, the Impact skill line is out of reach for cavalry units, making his performance in his intended game mode, Aether Raids Defense, a bit lacking. In all likelihood, you'll have to mooch off Bridal Catria and Thea for their【Triangle Attack】effect to give Múspell a better semblance of player phase threat, especially on AR-D. 

Double Effective Weaknesses

The cavalry dragon archetype is a bit of a curse that leaves him vulnerable to weapons that are effective against either end. Needless to say, enemies like Micaiah, Brave Eirika, and Brave Marth will often drill deeply into his otherwise rock-solid bulk. No amount of future-proofing will fix this as stronger cavalry and dragon units are introduced in Heroes and will thus require specialized countermeasures.

Weapon Skills

Weapons SP Rng. Mt.
Fire Breath
Learns by default at 1 ★
Unlocks at 1 ★
Only inheritable by Dragon units.
50 1 6
Fire Breath+
Learns by default at 2 ★
Unlocks at 2 ★
Only inheritable by Dragon units.
100 1 8
Flametongue
Learns by default at 4 ★
Unlocks at 3 ★
Only inheritable by Dragon units.
200 1 11
Flamelick BreathGrants Atk+3. At start of combat, if unit's HP ≥ 25%, grants Atk/Spd/Def/Res+5 to unit during combat and foe cannot recover HP during or after combat. If unit's HP ≥ 25% at start of combat, after combat, if unit attacked, inflicts【Deep Wounds】on target and foes within 2 spaces of target. If foe's Range = 2, calculates damage using the lower of foe's Def or Res.  【Deep Wounds】 Unit's HP cannot be healed through its next action.
Learns by default at 5 ★
Unlocks at 5 ★
Non-Inheritable skill.
400 1 16
Weapon Evolution
Weapon Upgrades
Weapon Upgrades

Support Skills

Support Skills Rng. SP
Rally AttackGrants Atk+4 to an adjacent ally until the end of the turn.
Learns by default at 4 ★
1 150
Rally Up AtkGrants Atk+3 to target ally and allies within 2 spaces of target (excluding unit) for 1 turn.
1 300
Rally Up Atk+Grants Atk+6 to target ally and allies within 2 spaces of target (excluding unit) for 1 turn.
1 400

Passive Skills

Passive Skills SP Slot
AR-D Def/Res 1If defending in Aether Raids, grants Def/Res+X during combat. (Calculates X based on number of your defensive structures: ≥5 structures grants +4; 4 grants +3; 3 grants +2; ≤2 grants +1. Destroyed defensive structures are not counted.)
Inheritable by all units.
Unlocks at 2 ★
60
A
AR-D Def/Res 2If defending in Aether Raids, grants Def/Res+X during combat. (Calculates X based on number of your defensive structures: ≥5 structures grants +7; 4 grants +5; 3 grants +3; ≤2 grants +1. Destroyed defensive structures are not counted.)
Inheritable by all units.
Unlocks at 3 ★
120
A
AR-D Def/Res 3If defending in Aether Raids, grants Def/Res+X during combat. (Calculates X based on number of your defensive structures: ≥5 structures grants +10; 4 grants +7; 3 grants +4; ≤2 grants +1. Destroyed defensive structures are not counted.)
Inheritable by all units.
Unlocks at 4 ★
240
A
AR-D Def/Res 4If defending in Aether Raids, grants Def/Res+X during combat. (Calculates X based on number of your defensive structures: ≥5 structures grants +11; 4 grants +7; ≤3 grants +3. Destroyed defensive structures are not counted.)
Inheritable by all units.
Unlocks at 5 ★
300
A
Dragon Wall 1If 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 × 2 (max 20%).
Only inheritable by Dragon units.
Unlocks at 1 ★
60
B
Dragon Wall 2If 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 × 3 (max 30%).  
Only inheritable by Dragon units.
Unlocks at 2 ★
120
B
Dragon Wall 3If 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 × 4 (max 40%).  
Only inheritable by Dragon units.
Unlocks at 4 ★
240
B
Domain of FlameGrants Atk/Def+4 and the effect "if unit's Atk > foe's Res during combat, unit's first attack deals damage = 30% of unit's Atk minus foe's Res" to allies within 2 spaces during combat. If unit is within 2 spaces of an ally, grants Atk/Def+4 to unit during combat, and also, if unit's Atk > foe's Res during combat, unit's first attack deals damage = 30% of unit's Atk minus foe's Res.
Non-Inheritable skill.
Unlocks at 5 ★
300
C

Other Info

Origin
Fire Emblem Heroes

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