Thunderclap•Attack

Is Thunderclap good in Slay the Spire 2?

Thunderclap is a common Ironclad attack in Slay the Spire 2. In combat it resolves as: Deal 4 damage and apply 1 Vulnerable to ALL enemies. It currently underperforms most alternatives, sitting at D tier in our Slay the Spire 2 card rankings.

Across 137 recorded runs, decks running it win 27.8% of the time, comfortably clear of the 18.9% average, by 8.9%. It’s a more selective pick, turning up in just 3.6% of decks that could run it. Ironclad players keep it in 19.1% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.1 times in the decks that take it.

It performs best next to Demonic Shield — together they post a +23.7% swing in win rate. It also has strong chemistry with the relic Razor Tooth, which moves its win rate by +24.1%. At 1 energy, it’s upgraded in 22.3% of runs and usually joins the deck around floor 13.

Upgraded, it gains +3 Damage, which is why so many decks invest a rest-site upgrade in it. That’s 32 wins, 83 deaths, and 22 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Queen Boss, which closes out 5.1% of its appearances. Read on for Thunderclap’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Ironclad run.

Best Cards to Pair with Thunderclap

Ranked by win-rate lift, Thunderclap performs best alongside Demonic Shield (+23.7%), Cruelty (+23.1%), and Second Wind (+21.2%).

Demonic Shield+23.7%9 runsCruelty+23.1%19 runsSecond Wind+21.2%15 runsRegret+20.6%4 runsBelieve in You+20.6%4 runsProwess+17.4%5 runs

Based on small co-occurring samples — treat these as early signals, not final verdicts.

Thunderclap Win Rate by Class

Thunderclap is played across 2 classes, led by Ironclad (28.3%) and Necrobinder (0.0%) by win rate.

The Ironclad28.3%135 runsThe Necrobinder0.0%2 runs

Best Relics for Thunderclap

Thunderclap pairs best with the relics Razor Tooth (+24.1%), Reptile Trinket (+23.8%), and Mercury Hourglass (+23.4%), ranked by win-rate lift.

Razor Tooth+24.1%5 runsReptile Trinket+23.8%8 runsMercury Hourglass+23.4%14 runsVenerable Tea Set+23.1%20 runsToxic Egg+20.6%5 runsAnchor+19.7%20 runs

Based on small co-occurring samples — treat these as early signals, not final verdicts.

Thunderclap Card Details

Thunderclap is a common attack costing 1 energy; it’s upgraded in 22.3% of runs and usually picked up by floor 13.

Deal 4 damage and apply 1 Vulnerable to ALL enemies.

Upgrade: +3 Damage

What Ends Runs with Thunderclap

Thunderclap’s most common run-enders are Queen Boss (5.1%), The Insatiable Boss (4.4%), and Knowledge Demon Boss (3.6%).

• Queen Boss5.1% of runs
• The Insatiable Boss4.4% of runs
• Knowledge Demon Boss3.6% of runs
• Test Subject Boss3.6% of runs
• Infested Prisms Elite2.9% of runs

See Also

Compare Thunderclap with the rest of the best Slay the Spire 2 cards, relics, and classes below.