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. Performance-wise it’s a steady, unspectacular pick rated C tier overall.

Over 236 tracked runs the win rate of decks holding it sits at 46.2%, 32.4% ahead of the 13.8% all-run baseline. It sees lighter play, carried in only 1.1% of runs. It does its best work in the hands of the Necrobinder, who post a 46.2% win rate with it. Within Necrobinder runs specifically, it’s carried 6.5% of the time.

Its standout card pairing is Demesne, which lifts the relic’s win rate by +26.1% when both are in play. It also works nicely with Glimpse Beyond, good for a +26.0% win-rate change. It typically enters the deck near floor 24. As a common relic, how often it’s offered depends on its rarity tier.

Of the runs that carried it, 109 ended in victory while 127 fell to a defeat. Its most common run-ender is Test Subject Boss, finishing 6.8% of the runs it appears in. See the best cards, class split, and threats below for the full read on whether Bone Flute is worth grabbing.

Pick or Skip: Bone Flute

Players take Bone Flute in 57.0% of the 426 offers it appears in; those runs win 46.5% against 29.6% for runs that passed, a pick lift of +16.2% over 243 decided runs.

Taken 243 times out of 426 offers.

Pick rate when offered counts offers, not runs: out of every time the game put this in front of a player, how often it was taken. It is not the same number as the share of runs that end up containing it.

Pick lift is the sample-adjusted gap between runs that took the option and runs that passed on it. It is the fair way to rank choices, because raw win rates put the smallest samples on top.

Best Cards with Bone Flute

The cards that gain the most from carrying Bone Flute are Demesne (+26.1%), Glimpse Beyond (+26.0%), and Death March (+23.0%), each shown with its win-rate swing.

Demesne+26.1%47 runsGlimpse Beyond+26.0%18 runsDeath March+23.0%26 runsTransfigure+20.5%30 runsReanimate+19.5%35 runsSeverance+19.3%29 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 46.2% win rate over 236 runs.

The Necrobinderappears in 6.5% of its runs (236 tracked)

Bone Flute Details

Carried in 1.1% of runs, Bone Flute is a common relic typically acquired near floor 24.

Whenever Osty attacks, gain Block.

What Ends Runs with Bone Flute

Runs carrying Bone Flute end most often against Test Subject Boss (6.8%), Aeonglass Boss (6.4%), and Queen Boss (5.1%) — the share of its runs each accounts for is shown.

• Test Subject Boss6.8% of runs
• Aeonglass Boss6.4% of runs
• Queen Boss5.1% of runs
• Knowledge Demon Boss3.0% of runs
• Decimillipede Elite2.5% of runs

See Also

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