Stone Armor•Power

Is Stone Armor good in Slay the Spire 2?

In Slay the Spire 2, Stone Armor is an uncommon power from the Ironclad card pool. Its effect: Gain 4 Plating. The data flags it as a weaker pick, settling at D tier — usually one to pass on unless your deck specifically wants it.

Over 350 tracked runs its win rate sits at 23.8%, 9.8% ahead of the 13.9% all-deck baseline. It sees niche play, included in only 3.0% of eligible runs. When it is actually offered players take it 21.4% of the time, and that looks correct: those runs win 23.9% against 19.6% for runs that passed, a +4.2% pick lift over 255 decided runs. Within Ironclad runs it’s drafted 12.7% 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 Cascade, which lifts its win rate by +22.4% when the two share a deck. On the relic side, Lizard Tail is its standout companion, worth a +27.6% win-rate swing alongside it. It costs 1 energy, gets upgraded 40.4% of the time, and tends to be picked up near floor 17.

Of the runs that drafted it, 82 ended in victory against 263 deaths and 5 abandons. Its most common run-ender is Test Subject Boss, finishing 7.1% of the runs it shows up in. See the synergies, class split, and threats below for the full picture of where Stone Armor fits a Ironclad deck.

Pick or Skip: Stone Armor

Players take Stone Armor in 21.4% of the 1343 offers it appears in; those runs win 23.9% against 19.6% for runs that passed, a pick lift of +4.2% over 255 decided runs.

Taken 287 times out of 1343 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 Stone Armor

Of the 4 pickup windows recorded for Stone Armor, Act 3 is the best: 71.1% across 45 runs.

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

Best Cards to Pair with Stone Armor

Stone Armor’s strongest card pairings so far are Cascade (+22.4%), Mad Science (+19.8%), and Unmovable (+18.7%), each shown with the win-rate lift it adds.

Cascade+22.4%21 runsMad Science+19.8%23 runsUnmovable+18.7%45 runsJuggling+17.0%40 runsNot Yet+16.6%33 runsOffering+15.1%47 runs

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

Stone Armor Win Rate by Class

Exclusive to the Ironclad, Stone Armor posts a 23.9% win rate over 344 tracked runs.

The Ironcladappears in 12.7% of its runs (344 tracked)

Best Relics for Stone Armor

The relics that swing Stone Armor’s win rate the most are Lizard Tail (+27.6%), Blood Vial (+25.2%), and Anchor (+22.4%), with each lift shown.

Lizard Tail+27.6%18 runsBlood Vial+25.2%54 runsAnchor+22.4%58 runsLord's Parasol+22.1%17 runsOddly Smooth Stone+20.0%49 runsLantern+19.4%65 runs

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

Stone Armor Card Details

A 1-energy uncommon power, Stone Armor is upgraded 40.4% of the time and tends to enter the deck around floor 17.

Gain 4 Plating.

What Ends Runs with Stone Armor

Runs holding Stone Armor end most often against Test Subject Boss (7.1%), Queen Boss (6.0%), and Kaiser Crab Boss (5.4%) — the share of its runs each accounts for is shown.

• Test Subject Boss7.1% of runs
• Queen Boss6.0% of runs
• Kaiser Crab Boss5.4% of runs
• Decimillipede Elite4.6% of runs
• Knowledge Demon Boss4.6% of runs

See Also

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