声なき叫び

Signature dualblade. When a Pyro character's HP recovers above 80%, the percentage counts as 30% for Morale and Resolve for 6s, with +40% Resolve. Still the best pick even at S0.

ホープアバンダンス

The fallback of choice while the signature is unavailable: it also provides Resolve.

プルガトリウム

Max HP +100% and Skill Duration when the character takes damage. Only worth it if already invested in.

リゾルトデプス

Max HP +100%, plus up to ten stacks of extra Max HP. Same caveat: only if already invested in.

ブラッディレイヴン

Calamity weapon tailor-made for Falsi: its Potentials bring Max HP and Resolve, turn lost HP into Calamity, and [Eclosion] damage counts as Overflow Damage. The Blueprint is sold at the Memento in the Immersive Theatre.

荊棘のレクイエム

The next best pick: Skill Intensity, Penetration and Morale on a single piece. Remember to unlock the Assault Rifle slot in Additional Proficiency, or its effects will not trigger.

繰生ノ爪

The best budget option: its Skill Intensity feeds all of her attacks.

ベストデイ

Provides Morale. In that case, swap Prime·Morale for Prime·Resolve in the Demon Wedges.