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 D tier in our Slay the Spire 2 card rankings.

Across 163 recorded runs, decks running it win 9.4% of the time, trailing the 12.6% average by 3.2%. It’s a popular draft, appearing in 31.4% 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 Transfigure — together they post a +57.2% swing in win rate. It also has strong chemistry with the relic Fragrant Mushroom, which moves its win rate by +90.5%. At 1 energy, it’s upgraded in 4.9% 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 12 wins, 115 deaths, and 36 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Phrog Parasite Elite, which closes out 7.4% 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 Transfigure (+57.2%), Mayhem (+57.2%), and Metamorphosis (+40.5%).

Transfigure+57.2%4 runsMayhem+57.2%3 runsMetamorphosis+40.5%4 runsShockwave+40.5%3 runsDebt+40.5%4 runsUndeath+35.0%9 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 9.4% win rate across 163 runs.

The Necrobinderappears in 94.8% of its runs (163 tracked)

Best Relics for Unleash

Unleash pairs best with the relics Fragrant Mushroom (+90.5%), Unceasing Top (+90.5%), and Tiny Mailbox (+65.5%), ranked by win-rate lift.

Fragrant Mushroom+90.5%3 runsUnceasing Top+90.5%4 runsTiny Mailbox+65.5%4 runsStrike Dummy+60.5%11 runsPael's Blood+57.2%3 runsSturdy Clamp+57.2%3 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 4.9% 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 Phrog Parasite Elite (7.4%), Bygone Effigy Elite (6.1%), and Terror Eel Elite (5.5%).

• Phrog Parasite Elite7.4% of runs
• Bygone Effigy Elite6.1% of runs
• Terror Eel Elite5.5% of runs
• Phantasmal Gardeners Elite4.3% of runs
• Infested Prisms Elite3.7% of runs

See Also

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