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 4285 recorded runs, decks running it win 14.3% of the time, right in line with the typical deck. It’s a popular draft, appearing in 15.9% of eligible decks. Necrobinder players keep it in 93.0% 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 +47.3% swing in win rate. It also has strong chemistry with the relic History Course, which moves its win rate by +57.7%. At 1 energy, it’s upgraded in 11.1% 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 600 wins, 3607 deaths, and 78 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Decimillipede Elite, which closes out 4.2% 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.

When to Pick Up Unleash

Unleash is strongest when it joins the deck in Starting deck, where runs win 14.2% across 4277 runs — one of 2 recorded pickup windows.

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

Best Cards to Pair with Unleash

Ranked by win-rate lift, Unleash performs best alongside Mad Science (+47.3%), Apotheosis (+38.2%), and Folly (+38.0%).

Mad Science+47.3%151 runsApotheosis+38.2%27 runsFolly+38.0%31 runsWhistle+30.8%22 runsGold Axe+30.7%31 runsGlimpse Beyond+29.3%108 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 14.3% win rate across 4285 runs.

The Necrobinderappears in 93.0% of its runs (4285 tracked)

Best Relics for Unleash

Unleash pairs best with the relics History Course (+57.7%), Iron Club (+52.6%), and Sword of Jade (+50.0%), ranked by win-rate lift.

History Course+57.7%42 runsIron Club+52.6%28 runsSword of Jade+50.0%42 runsFragrant Mushroom+45.4%145 runsLooming Fruit+42.1%44 runsSai+41.9%46 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 11.1% 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 Decimillipede Elite (4.2%), Knowledge Demon Boss (3.6%), and Phrog Parasite Elite (3.3%).

• Decimillipede Elite4.2% of runs
• Knowledge Demon Boss3.6% of runs
• Phrog Parasite Elite3.3% of runs
• Bygone Effigy Elite2.9% of runs
• Infested Prisms Elite2.8% of runs

See Also

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