Impervious•Skill

Is Impervious good in Slay the Spire 2?

In Slay the Spire 2, Impervious is a rare skill from the Ironclad card pool. Its effect: Gain 30 Block. Performance-wise it’s a solid if unspectacular include, rated C tier overall.

Over 64 tracked runs its win rate sits at 32.2%, 13.3% ahead of the 19.0% all-deck baseline. It sees niche play, included in only 1.7% of eligible runs. Within Silent runs it’s drafted 0.2% 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 Ashen Strike, which lifts its win rate by +25.4% when the two share a deck. On the relic side, Bag of Preparation is its standout companion, worth a +19.0% win-rate swing alongside it. It costs 2 energy, gets upgraded 14.9% of the time, and tends to be picked up near floor 20.

Upgrading the card adds +10 Block to its stat line. Of the runs that drafted it, 19 ended in victory against 40 deaths and 5 abandons. Its most common run-ender is Knowledge Demon Boss, finishing 10.9% of the runs it shows up in. See the synergies, class split, and threats below for the full picture of where Impervious fits a Ironclad deck.

Best Cards to Pair with Impervious

Impervious’s strongest card pairings so far are Ashen Strike (+25.4%), Burning Pact (+19.0%), and Offering (+16.1%), each shown with the win-rate lift it adds.

Ashen Strike+25.4%6 runsBurning Pact+19.0%9 runsOffering+16.1%8 runsBrand+16.1%7 runsFight Me!+15.9%6 runsCruelty+13.5%8 runs

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

Impervious Win Rate by Class

Of the 3 classes that draft Impervious, it performs best with Silent (50.0%), Ironclad (32.1%), and Necrobinder (0.0%).

The Silent50.0%2 runsThe Ironclad32.1%61 runsThe Necrobinder0.0%1 runs

Best Relics for Impervious

The relics that swing Impervious’s win rate the most are Bag of Preparation (+19.0%), Venerable Tea Set (+18.6%), and Potion Belt (+16.1%), with each lift shown.

Bag of Preparation+19.0%8 runsVenerable Tea Set+18.6%16 runsPotion Belt+16.1%7 runsRed Skull+15.9%5 runsWhite Star+15.7%3 runsStone Calendar+15.7%4 runs

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

Impervious Card Details

A 2-energy rare skill, Impervious is upgraded 14.9% of the time and tends to enter the deck around floor 20.

Gain 30 Block.

Upgrade: +10 Block

What Ends Runs with Impervious

Runs holding Impervious end most often against Knowledge Demon Boss (10.9%), Kaiser Crab Boss (7.8%), and Queen Boss (7.8%) — the share of its runs each accounts for is shown.

• Knowledge Demon Boss10.9% of runs
• Kaiser Crab Boss7.8% of runs
• Queen Boss7.8% of runs
• The Insatiable Boss4.7% of runs
• Doormaker Boss4.7% of runs

See Also

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