Fiend FireAttack
Exhaust your Hand. Deal 7 damage for each card Exhausted.
Is Fiend Fire good in Slay the Spire 2?
In Slay the Spire 2, Fiend Fire is a rare attack from the Ironclad card pool. Its effect: Exhaust your Hand. Deal 7 damage for each card Exhausted. The data flags it as a weaker pick, settling at F tier — usually one to pass on unless your deck specifically wants it.
Over 37 tracked runs its win rate sits at 16.1%, 2.8% short of the 18.9% all-deck baseline. It sees niche play, included in only 1.0% of eligible runs. Within Ironclad runs it’s drafted 5.2% of the time, making it a regular part of that class’s decks. Decks that include it run about 1.1 copies on average.
Its standout pairing so far is Twin Strike, which lifts its win rate by +12.7% when the two share a deck. On the relic side, Pael's Blood is its standout companion, worth a +16.8% win-rate swing alongside it. It costs 2 energy, gets upgraded 35.9% of the time, and tends to be picked up near floor 16.
Upgrading the card adds +3 Damage to its stat line. Of the runs that drafted it, 5 ended in victory against 26 deaths and 6 abandons. Its most common run-ender is The Insatiable Boss, finishing 13.5% of the runs it shows up in. See the synergies, class split, and threats below for the full picture of where Fiend Fire fits a Ironclad deck.
Fiend Fire Win Rate & Pick Rate
At a 16.1% win rate, Fiend Fire runs 2.8% behind the 18.9% all-deck baseline — the bars below put the two side by side.
Run Outcomes with Fiend Fire
Across the 37 tracked runs that drafted Fiend Fire, 5 ended in a win and 32 in a loss — a 13.5% win share, counting abandons as losses.
- Wins 13.5%
- Losses 86.5%
Best Cards to Pair with Fiend Fire
Fiend Fire’s strongest card pairings so far are Twin Strike (+12.7%), Pyre (+11.7%), and Body Slam (+9.5%), each shown with the win-rate lift it adds.
Based on small co-occurring samples — treat these as early signals, not final verdicts.
Fiend Fire Win Rate by Class
Exclusive to the Ironclad, Fiend Fire posts a 16.1% win rate over 37 tracked runs.
The Ironcladappears in 5.2% of its runs (37 tracked)Best Relics for Fiend Fire
The relics that swing Fiend Fire’s win rate the most are Pael's Blood (+16.8%), Potion Belt (+12.7%), and Tiny Mailbox (+11.7%), with each lift shown.
Based on small co-occurring samples — treat these as early signals, not final verdicts.
Fiend Fire Card Details
A 2-energy rare attack, Fiend Fire is upgraded 35.9% of the time and tends to enter the deck around floor 16.
Exhaust your Hand. Deal 7 damage for each card Exhausted.
Upgrade: +3 Damage
What Ends Runs with Fiend Fire
Runs holding Fiend Fire end most often against The Insatiable Boss (13.5%), Knowledge Demon Boss (10.8%), and Ceremonial Beast Boss (8.1%) — the share of its runs each accounts for is shown.
- The Insatiable Boss13.5% of runs
- Knowledge Demon Boss10.8% of runs
- Ceremonial Beast Boss8.1% of runs
- Test Subject Boss8.1% of runs
- Entomancer Elite5.4% of runs
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Fiend Fire – Frequently Asked Questions
Is Fiend Fire good in Slay the Spire 2?
Across 37 tracked runs, Fiend Fire has a 16.1% win rate — +2.8% below the average deck. Win rate reflects how often runs that include the card end in victory.
What does Fiend Fire do in Slay the Spire 2?
Fiend Fire costs 2 energy. Exhaust your Hand. Deal 7 damage for each card Exhausted.
What class is Fiend Fire in Slay the Spire 2?
Fiend Fire is a Rare Ironclad Attack.
Is Fiend Fire worth upgrading in Slay the Spire 2?
Players upgrade Fiend Fire in 35.9% of runs. Upgrading it grants +3 Damage.
What is the best relic for Fiend Fire?
In tracked runs, Fiend Fire has performed best alongside Pael's Blood, which lifts its win rate by +16.8% over 4 runs together.
See Also
Keep exploring Slay the Spire 2 tier lists and stats below.