Holy Flame Adin — Epic Seven Fire Thief: RTA Build, Counters & Win Rate

Holy Flame Adin is a 3-star Fire Thief built around single-target swordplay and self-sustain. Her basic attack strikes one enemy and heals the most-wounded ally, with the heal growing larger the more damage she deals. Her main skill is a single-target multi-hit that has a chance to lower the target's Defense for 2 turns while ignoring their Effect Resistance, and it grants her a personal Willful Flame buff for 2 turns. Her passive is conditional: only after the whole team is hit by an area attack, and only while she is carrying a debuff, she may counter every enemy at once with a fiery sweep that also speeds her up, and this can fire at most once every 2 turns.

Counters

Defense-heavy bruisers and walls — Her main skill can lower a single target's Defense for 2 turns and pierces Effect Resistance, so sturdy frontliners that rely on high Defense get cracked open and take far more damage from her and her allies.
Enemies leaning on stalls and slow attrition — Every basic attack she lands restores Health to her most-wounded ally and scales that healing with the damage dealt, letting her team out-sustain damage-over-time and grind teams that try to win by outlasting.
Teams that open with a big area-of-effect hit — Suffering an attack on all allies while she holds a debuff lets her counter every enemy at once and gain Speed, punishing opponents who try to wipe the whole team with one sweeping blow.
Low-Speed opponents she can outpace — Her counter grants her Speed for a turn, helping her cycle her Defense-break and healing faster against slower lineups and stay ahead in the turn order.

Countered by

Cleansing and debuff-shortening supports — Her Defense-break is her main pressure tool; an ally that cleanses it off or shortens its duration removes the opening before her team can capitalize, and stripping her own debuff also shuts off her passive counter.
Anti-heal effects that block recovery — Her sustain comes entirely from healing the lowest-Health ally on attack; an enemy that applies unhealable prevents that recovery and lets a team push through her durability.
Single-target focus fire and burst — Outside her conditional passive she only hits one enemy at a time, so she does not threaten a whole team at once and can be picked off or controlled before her 5-turn Defense-break skill comes back up.
Counter-suppression and the passive's strict conditions — Her area counter needs the whole team to be hit, needs her to be holding a debuff, and can only fire once every 2 turns, so single-target attackers and anything that blocks counterattacks simply never trigger it.

counterHarsetti56%

counterMort61%

counterStraze56%

counterAfternoon Soak Flan54%

counterBlood Blade Karin53%

Skills

S1Ankle Cut

Attacks the enemy with a sword, recovering Health of the ally with the lowest Health. Amount recovered increases proportional to damage dealt.

PDefensive Spirit

After suffering an attack that targets all allies, when the caster has a debuff, has a X chance to counterattack with Fiery Blade Gust. Fiery Blade Gust takes priority over a counterattack with a basic skill. This effect can only be activated once every 2 turns. Fiery Blade Gust: Attacks all enemies with a blade gust, and increases Speed of the caster for 1 turn.

S3Explosive CutCD 5

Attacks the enemy repeatedly, with a X chance to --decrease Defense-- of the target for 2 turns. Grants Willful Flame to the caster for 2 turns.

Soulburn −20 soulsIgnores Effect Reistance.