Unleash•Attack

Is Unleash good in Slay the Spire 2?

Unleash is a basic Necrobinder attack in Slay the Spire 2. In combat it resolves as: Osty deals 6 damage. Deals additional damage equal to Osty's current HP. It currently underperforms most alternatives, sitting at F tier in our Slay the Spire 2 card rankings.

Across 788 recorded runs, decks running it win 16.8% of the time, trailing the 19.0% average by 2.2%. It’s a popular draft, appearing in 20.8% of eligible decks. Necrobinder players keep it in 94.8% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.0 times in the decks that take it.

It performs best next to Mad Science — together they post a +35.5% swing in win rate. It also has strong chemistry with the relic History Course, which moves its win rate by +36.6%. At 1 energy, it’s upgraded in 9.4% of runs and usually joins the deck around floor 1.

Upgraded, it gains +3 CalculationBase, which is why so many decks invest a rest-site upgrade in it. That’s 97 wins, 481 deaths, and 210 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Bygone Effigy Elite, which closes out 3.8% of its appearances. Read on for Unleash’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Necrobinder run.

Best Cards to Pair with Unleash

Ranked by win-rate lift, Unleash performs best alongside Mad Science (+35.5%), Legion of Bone (+31.4%), and Squash (+27.7%).

Mad Science+35.5%20 runsLegion of Bone+31.4%10 runsSquash+27.7%15 runsGlimpse Beyond+27.2%13 runsFasten+23.6%16 runsDemesne+21.3%65 runs

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

Unleash Win Rate by Class

Unleash is drafted only by the Necrobinder, where it holds a 16.8% win rate across 788 runs.

The Necrobinderappears in 94.8% of its runs (788 tracked)

Best Relics for Unleash

Unleash pairs best with the relics History Course (+36.6%), Sword of Jade (+36.6%), and Fragrant Mushroom (+33.8%), ranked by win-rate lift.

History Course+36.6%11 runsSword of Jade+36.6%10 runsFragrant Mushroom+33.8%19 runsSignet Ring+31.4%8 runsFunerary Mask+30.4%20 runsOddly Smooth Stone+29.4%58 runs

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

Unleash Card Details

Unleash is a basic attack costing 1 energy; it’s upgraded in 9.4% of runs and usually picked up by floor 1.

Osty deals 6 damage. Deals additional damage equal to Osty's current HP.

Upgrade: +3 CalculationBase

What Ends Runs with Unleash

Unleash’s most common run-enders are Bygone Effigy Elite (3.8%), Phrog Parasite Elite (3.7%), and Decimillipede Elite (3.7%).

• Bygone Effigy Elite3.8% of runs
• Phrog Parasite Elite3.7% of runs
• Decimillipede Elite3.7% of runs
• Terror Eel Elite2.9% of runs
• Knowledge Demon Boss2.9% of runs

See Also

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