Coolheaded Skill

Is Coolheaded good in Slay the Spire 2?

Coolheaded is a common Defect skill in Slay the Spire 2. In combat it resolves as: Channel 1 Frost. Draw cards. It currently underperforms most alternatives, sitting at D tier in our Slay the Spire 2 card rankings.

Across 946 recorded runs, decks running it win 19.1% of the time, comfortably clear of the 13.8% average, by 5.2%. It’s a more selective pick, turning up in just 4.5% of decks that could run it. Offer data backs the pick — taken 21.1% of the time it is shown, with 20.0% for runs that took it against 13.7% for runs that did not, a +6.2% pick lift across 786 decided runs. Defect players keep it in 20.2% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.3 times in the decks that take it.

It performs best next to Apotheosis — together they post a +20.6% swing in win rate. It also has strong chemistry with the relic Cloak Clasp, which moves its win rate by +39.3%. At 1 energy, it’s upgraded in 30.1% of runs and usually joins the deck around floor 12.

Upgraded, it gains +1 Cards, which is why so many decks invest a rest-site upgrade in it. That’s 178 wins, 756 deaths, and 12 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Kaiser Crab Boss, which closes out 5.1% of its appearances. Read on for Coolheaded’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Defect run.

Pick or Skip: Coolheaded

Out of 4494 recorded offers Coolheaded is taken 21.1% of the time, and taking it is worth +6.2% in pick lift — 20.0% for runs that picked it against 13.7% for runs that skipped, across 786 decided runs.

Taken 947 times out of 4494 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 Coolheaded

Coolheaded is strongest when it joins the deck in Act 3, where runs win 47.6% across 63 runs — one of 4 recorded pickup windows.

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

Best Cards to Pair with Coolheaded

Ranked by win-rate lift, Coolheaded performs best alongside Apotheosis (+20.6%), Mad Science (+20.5%), and Energy Surge (+20.4%).

Apotheosis+20.6%15 runsMad Science+20.5%58 runsEnergy Surge+20.4%49 runsMachine Learning+17.8%101 runsFlak Cannon+17.1%70 runsProduction+16.8%26 runs

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

Coolheaded Win Rate by Class

Coolheaded is drafted only by the Defect, where it holds a 18.9% win rate across 925 runs.

The Defectappears in 20.2% of its runs (925 tracked)

Best Relics for Coolheaded

Coolheaded pairs best with the relics Cloak Clasp (+39.3%), Signet Ring (+30.6%), and Mummified Hand (+29.1%), ranked by win-rate lift.

Cloak Clasp+39.3%32 runsSignet Ring+30.6%19 runsMummified Hand+29.1%24 runsSai+29.0%21 runsSword of Jade+28.9%19 runsData Disk+27.4%120 runs

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

Coolheaded Card Details

Coolheaded is a common skill costing 1 energy; it’s upgraded in 30.1% of runs and usually picked up by floor 12.

Channel 1 Frost. Draw cards.

Upgrade: +1 Cards

What Ends Runs with Coolheaded

Coolheaded’s most common run-enders are Kaiser Crab Boss (5.1%), Aeonglass Boss (5.0%), and Test Subject Boss (4.9%).

• Kaiser Crab Boss5.1% of runs
• Aeonglass Boss5.0% of runs
• Test Subject Boss4.9% of runs
• Queen Boss4.7% of runs
• Knowledge Demon Boss4.5% of runs

See Also

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