Bone Shards•Attack

Is Bone Shards good in Slay the Spire 2?

Bone Shards is an uncommon Necrobinder attack in Slay the Spire 2. In combat it resolves as: If Osty is alive, he deals 9 damage to ALL enemies and you gain 9 Block. Osty dies. It currently underperforms most alternatives, sitting at F tier in our Slay the Spire 2 card rankings.

Across 69 recorded runs, decks running it win 12.9% of the time, trailing the 18.9% average by 6.0%. It’s a more selective pick, turning up in just 1.8% of decks that could run it. Necrobinder players keep it in 8.3% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.1 times in the decks that take it.

It performs best next to Afterlife — together they post a +17.7% swing in win rate. It also has strong chemistry with the relic Fresnel Lens, which moves its win rate by +20.1%. At 1 energy, it’s upgraded in 17.3% of runs and usually joins the deck around floor 11.

Upgraded, it gains +3 OstyDamage, +3 Block, which is why so many decks invest a rest-site upgrade in it. That’s 8 wins, 54 deaths, and 7 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Decimillipede Elite, which closes out 7.2% of its appearances. Read on for Bone Shards’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Necrobinder run.

Best Cards to Pair with Bone Shards

Ranked by win-rate lift, Bone Shards performs best alongside Afterlife (+17.7%), Countdown (+17.5%), and Sleight of Flesh (+15.7%).

Afterlife+17.7%5 runsCountdown+17.5%14 runsSleight of Flesh+15.7%12 runsBorrowed Time+15.7%14 runsGrave Warden+15.7%23 runsDemesne+14.9%9 runs

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

Bone Shards Win Rate by Class

Bone Shards is drafted only by the Necrobinder, where it holds a 12.9% win rate across 69 runs.

The Necrobinderappears in 8.3% of its runs (69 tracked)

Best Relics for Bone Shards

Bone Shards pairs best with the relics Fresnel Lens (+20.1%), Anchor (+18.6%), and Bag of Preparation (+18.6%), ranked by win-rate lift.

Fresnel Lens+20.1%4 runsAnchor+18.6%12 runsBag of Preparation+18.6%10 runsFestive Popper+18.2%7 runsLantern+18.2%8 runsCandelabra+17.7%5 runs

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

Bone Shards Card Details

Bone Shards is an uncommon attack costing 1 energy; it’s upgraded in 17.3% of runs and usually picked up by floor 11.

If Osty is alive, he deals 9 damage to ALL enemies and you gain 9 Block. Osty dies.

Upgrade: +3 OstyDamage, +3 Block

What Ends Runs with Bone Shards

Bone Shards’s most common run-enders are Decimillipede Elite (7.2%), Knowledge Demon Boss (5.8%), and Entomancer Elite (5.8%).

• Decimillipede Elite7.2% of runs
• Knowledge Demon Boss5.8% of runs
• Entomancer Elite5.8% of runs
• Infested Prisms Elite5.8% of runs
• Lagavulin Matriarch Boss4.3% of runs

See Also

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