Bone Flute•Relic

Is Bone Flute good in Slay the Spire 2?

In Slay the Spire 2, Bone Flute is a common relic you can pick up on your climb. Its effect: Whenever Osty attacks, gain Block. The data marks it as a weaker relic, settling at D tier — rarely a run-defining grab.

Over 7 tracked runs the win rate of decks holding it sits at 28.6%, 15.9% ahead of the 12.6% all-run baseline. It sees lighter play, carried in only 1.4% of runs. It does its best work in the hands of the Necrobinder, who post a 28.6% win rate with it. Within Necrobinder runs specifically, it’s carried 4.1% of the time.

Its standout card pairing is Demesne, which lifts the relic’s win rate by +38.1% when both are in play. It also works nicely with Dirge, good for a +21.4% win-rate change. It typically enters the deck near floor 18. As a common relic, how often it’s offered depends on its rarity tier.

Of the runs that carried it, 2 ended in victory while 5 fell to a defeat. See the best cards, class split, and threats below for the full read on whether Bone Flute is worth grabbing.

Best Cards with Bone Flute

The cards that gain the most from carrying Bone Flute are Demesne (+38.1%), Dirge (+21.4%), and Grave Warden (+21.4%), each shown with its win-rate swing.

Demesne+38.1%3 runsDirge+21.4%4 runsGrave Warden+21.4%4 runsWisp+21.4%4 runsDeathbringer+4.8%3 runsBone Shards+4.8%3 runs

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

Bone Flute Win Rate by Class

Bone Flute’s class data comes mostly from the Necrobinder, at a 28.6% win rate over 7 runs.

The Necrobinderappears in 4.1% of its runs (7 tracked)

Bone Flute Details

Carried in 1.4% of runs, Bone Flute is a common relic typically acquired near floor 18.

Whenever Osty attacks, gain Block.

See Also

Keep exploring Slay the Spire 2 tier lists and stats below.