Should I upgrade Fiend Fire in Slay the Spire 2?

Compare the upgraded text: Exhaust your Hand. Deal 10 damage for each card Exhausted. Exhaust.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.

What builds use Fiend Fire?

Fiend Fire appears in 1 tracked build: Ashen Reaper of the Pyre (A-tier, core card).

What character uses Fiend Fire?

Fiend Fire is tagged as a Ironclad card. See the Ironclad build hub for archetypes that care about it.

Updated for Data 2026-03-17Early Access — numbers may shift with patches.

Fiend Fire

Ironclad · Attack · Rare · 2 cost

Base

Upgraded

Card text

Exhaust your Hand. Deal 7 damage for each card Exhausted. Exhaust.

Fiend Fire+

Exhaust your Hand. Deal 10 damage for each card Exhausted. Exhaust.

Builds that use Fiend Fire

Archetypes that draft this card in real runs, with the role it plays.

AAshen Reaper of the PyreIronclad · Core card

Keywords

Exhaust

Build context

See the Ironclad build hub for archetypes that feature this card in real runs.

Related cards

Fiend Fire FAQ

Should I upgrade Fiend Fire in Slay the Spire 2?: Compare the upgraded text: Exhaust your Hand. Deal 10 damage for each card Exhausted. Exhaust.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.
What builds use Fiend Fire?: Fiend Fire appears in 1 tracked build: Ashen Reaper of the Pyre (A-tier, core card).
What character uses Fiend Fire?: Fiend Fire is tagged as a Ironclad card. See the Ironclad build hub for archetypes that care about it.

Patch history

SpireForge snapshots card text from Untapped exports dated 2026-03-17. When Mega Crit ships a balance patch, we re-run the scraper and refresh every affected URL—see /patches for the editorial log.