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 891 recorded runs, decks running it win 21.6% of the time, comfortably clear of the 13.8% average, by 7.7%. It’s a more selective pick, turning up in just 4.3% of decks that could run it. Offer data is close to a wash — 17.2% of offers taken, 21.6% for runs that picked it against 19.8% for runs that skipped, a pick lift of just +1.8% over 745 decided runs. Ironclad players keep it in 19.0% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.2 times in the decks that take it.

It performs best next to Demonic Shield — together they post a +32.4% swing in win rate. It also has strong chemistry with the relic Sword of Jade, which moves its win rate by +36.5%. At 1 energy, it’s upgraded in 22.5% of runs and usually joins the deck around floor 11.

Upgraded, it gains +3 Damage, which is why so many decks invest a rest-site upgrade in it. That’s 189 wins, 687 deaths, and 15 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Kaiser Crab Boss, which closes out 6.3% 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.

Pick or Skip: Thunderclap

Out of 4966 recorded offers Thunderclap is taken 17.2% of the time, and taking it is worth +1.8% in pick lift — 21.6% for runs that picked it against 19.8% for runs that skipped, across 745 decided runs.

Taken 852 times out of 4966 offers.

Pick rate when offered counts offers, not runs: out of every time the game put this in front of a player, how often it was taken. It is not the same number as the share of runs that end up containing it.

Pick lift is the sample-adjusted gap between runs that took the option and runs that passed on it. It is the fair way to rank choices, because raw win rates put the smallest samples on top.

When to Pick Up Thunderclap

Thunderclap is strongest when it joins the deck in Act 3, where runs win 60.0% across 45 runs — one of 4 recorded pickup windows.

Win rate of runs by the act Thunderclap entered the deck. Acts that have not reached the sample floor show their run count only.

Best Cards to Pair with Thunderclap

Ranked by win-rate lift, Thunderclap performs best alongside Demonic Shield (+32.4%), Mad Science (+25.9%), and Master of Strategy (+23.1%).

Demonic Shield+32.4%44 runsMad Science+25.9%64 runsMaster of Strategy+23.1%15 runsStoke+22.8%49 runsHidden Gem+21.3%16 runsDoubt+20.3%19 runs

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

Thunderclap Win Rate by Class

Thunderclap is drafted only by the Ironclad, where it holds a 21.7% win rate across 876 runs.

The Ironcladappears in 19.0% of its runs (876 tracked)

Best Relics for Thunderclap

Thunderclap pairs best with the relics Sword of Jade (+36.5%), Throwing Axe (+32.6%), and Vambrace (+32.1%), ranked by win-rate lift.

Sword of Jade+36.5%23 runsThrowing Axe+32.6%18 runsVambrace+32.1%76 runsLooming Fruit+30.7%19 runsLee's Waffle+28.9%20 runsPocketwatch+28.8%30 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 22.5% of runs and usually picked up by floor 11.

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 Kaiser Crab Boss (6.3%), Test Subject Boss (5.7%), and Knowledge Demon Boss (4.8%).

• Kaiser Crab Boss6.3% of runs
• Test Subject Boss5.7% of runs
• Knowledge Demon Boss4.8% of runs
• The Insatiable Boss4.3% of runs
• Decimillipede Elite4.3% of runs

See Also

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