Calcify Power

Is Calcify good in Slay the Spire 2?

In Slay the Spire 2, Calcify is an uncommon power from the Necrobinder card pool. Its effect: Osty's attacks deal 4 additional damage. The data flags it as a weaker pick, settling at D tier — usually one to pass on unless your deck specifically wants it.

Over 363 tracked runs its win rate sits at 24.4%, 10.6% ahead of the 13.8% all-deck baseline. It sees niche play, included in only 1.7% of eligible runs. Offer data argues the other way: taken 19.6% of the time it is shown, runs that picked it win 25.5% against 28.9% for runs that passed — a -3.3% pick lift across 251 decided runs. Within Necrobinder runs it’s drafted 10.0% of the time, making it a regular part of that class’s decks. Decks that include it run about 1.2 copies on average.

Its standout pairing so far is Mad Science, which lifts its win rate by +33.7% when the two share a deck. On the relic side, Bone Flute is its standout companion, worth a +28.1% win-rate swing alongside it. It costs 1 energy, gets upgraded 35.7% of the time, and tends to be picked up near floor 14.

Of the runs that drafted it, 88 ended in victory against 272 deaths and 3 abandons. Its most common run-ender is Knowledge Demon Boss, finishing 9.1% of the runs it shows up in. See the synergies, class split, and threats below for the full picture of where Calcify fits a Necrobinder deck.

Pick or Skip: Calcify

Players take Calcify in 19.6% of the 1460 offers it appears in; those runs win 25.5% against 28.9% for runs that passed, a pick lift of -3.3% over 251 decided runs.

Taken 286 times out of 1460 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.

When to Pick Up Calcify

Of the 4 pickup windows recorded for Calcify, Act 3 is the best: 44.0% across 25 runs.

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

Best Cards to Pair with Calcify

Calcify’s strongest card pairings so far are Mad Science (+33.7%), Eradicate (+21.0%), and Shared Fate (+19.5%), each shown with the win-rate lift it adds.

Mad Science+33.7%20 runsEradicate+21.0%24 runsShared Fate+19.5%32 runsBorrowed Time+17.6%60 runsUltimate Defend+17.3%15 runsDemesne+17.3%51 runs

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

Calcify Win Rate by Class

Exclusive to the Necrobinder, Calcify posts a 24.4% win rate over 363 tracked runs.

The Necrobinderappears in 10.0% of its runs (363 tracked)

Best Relics for Calcify

The relics that swing Calcify’s win rate the most are Bone Flute (+28.1%), Pendulum (+23.9%), and Fragrant Mushroom (+23.8%), with each lift shown.

Bone Flute+28.1%46 runsPendulum+23.9%53 runsFragrant Mushroom+23.8%22 runsIce Cream+23.7%20 runsWhetstone+23.1%55 runsOrnamental Fan+22.2%36 runs

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

Calcify Card Details

A 1-energy uncommon power, Calcify is upgraded 35.7% of the time and tends to enter the deck around floor 14.

Osty's attacks deal 4 additional damage.

What Ends Runs with Calcify

Runs holding Calcify end most often against Knowledge Demon Boss (9.1%), Decimillipede Elite (6.1%), and Test Subject Boss (4.7%) — the share of its runs each accounts for is shown.

• Knowledge Demon Boss9.1% of runs
• Decimillipede Elite6.1% of runs
• Test Subject Boss4.7% of runs
• Queen Boss4.1% of runs
• Aeonglass Boss3.3% of runs

See Also

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