Crimson Mantle•Power

Is Crimson Mantle good in Slay the Spire 2?

In Slay the Spire 2, Crimson Mantle is a rare power from the Ironclad card pool. Its effect: At the start of your turn, lose 1 HP and gain 8 Block. Right now it’s a premium pick that sits at B tier — one of the better cards you can add to a deck this run.

Over 235 tracked runs its win rate sits at 34.3%, 20.4% ahead of the 13.9% all-deck baseline. It sees niche play, included in only 2.0% of eligible runs. When it is actually offered players take it 43.6% of the time, and that looks correct: those runs win 36.6% against 23.1% for runs that passed, a +12.8% pick lift over 202 decided runs. Within Ironclad runs it’s drafted 8.4% of the time, making it a regular part of that class’s decks. Decks that include it run about 1.1 copies on average.

Its standout pairing so far is Stoke, which lifts its win rate by +31.6% when the two share a deck. On the relic side, Venerable Tea Set is its standout companion, worth a +28.8% win-rate swing alongside it. It costs 1 energy, gets upgraded 42.3% of the time, and tends to be picked up near floor 18.

Of the runs that drafted it, 80 ended in victory against 153 deaths and 2 abandons. Its most common run-ender is Kaiser Crab Boss, finishing 6.4% of the runs it shows up in. See the synergies, class split, and threats below for the full picture of where Crimson Mantle fits a Ironclad deck.

Pick or Skip: Crimson Mantle

Players take Crimson Mantle in 43.6% of the 486 offers it appears in; those runs win 36.6% against 23.1% for runs that passed, a pick lift of +12.8% over 202 decided runs.

Taken 212 times out of 486 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 Crimson Mantle

Of the 3 pickup windows recorded for Crimson Mantle, Act 3 is the best: 63.6% across 11 runs.

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

Best Cards to Pair with Crimson Mantle

Crimson Mantle’s strongest card pairings so far are Stoke (+31.6%), Mad Science (+21.9%), and Feel No Pain (+18.2%), each shown with the win-rate lift it adds.

Stoke+31.6%21 runsMad Science+21.9%21 runsFeel No Pain+18.2%29 runsBattle Trance+17.3%78 runsOffering+16.6%34 runsPyre+16.6%34 runs

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

Crimson Mantle Win Rate by Class

Exclusive to the Ironclad, Crimson Mantle posts a 34.7% win rate over 227 tracked runs.

The Ironcladappears in 8.4% of its runs (227 tracked)

Best Relics for Crimson Mantle

The relics that swing Crimson Mantle’s win rate the most are Venerable Tea Set (+28.8%), Strike Dummy (+20.8%), and Meal Ticket (+18.5%), with each lift shown.

Venerable Tea Set+28.8%43 runsStrike Dummy+20.8%47 runsMeal Ticket+18.5%40 runsShuriken+17.3%16 runsBag of Preparation+17.3%47 runsMercury Hourglass+17.0%22 runs

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

Crimson Mantle Card Details

A 1-energy rare power, Crimson Mantle is upgraded 42.3% of the time and tends to enter the deck around floor 18.

At the start of your turn, lose 1 HP and gain 8 Block.

What Ends Runs with Crimson Mantle

Runs holding Crimson Mantle end most often against Kaiser Crab Boss (6.4%), Knowledge Demon Boss (6.4%), and Queen Boss (5.5%) — the share of its runs each accounts for is shown.

• Kaiser Crab Boss6.4% of runs
• Knowledge Demon Boss6.4% of runs
• Queen Boss5.5% of runs
• Decimillipede Elite5.1% of runs
• Test Subject Boss3.8% of runs

See Also

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