Antewise

Impervious — Ironclad Skill Card in Slay the Spire 2

Updated 17 Oct 2026 Source Slay the Spire 2 card data (spire-codex.com API), 577 cards retrieved 17 October 2026 By
Data status: The facts on this page were checked against the source named above. Game values can still shift with a patch, so re-check anything that looks off.
Impervious card art
Impervious

Gain 30 Block.

CharacterIronclad
TypeSkill
RarityRare
Cost2 Energy
TargetSelf
Total Block30
Per Energy15.00 → 20.00 upgraded
KeywordsExhaust

Card text

Gain 30 Block.

Upgraded: Gain 40 Block.

Where it sits on the curve

Measured the same way as our efficiency tier list: total Block divided by Energy.

Impervious produces 15.00 per Energy at base and <strong>20.00</strong> upgraded. That ranks it 1 of 56 of the 56 skills with a fixed cost. It sits in the top 100% on this measure.

The measure ignores everything that is not a number. Area damage, conditions and drawbacks are not priced in.

Other Ironclad cards at 2 Energy

  • Bash — Deal 8 damage. Apply 2 Vulnerable.
  • Blood Wall — Lose 2 HP. Gain 16 Block.
  • Cinder — Deal 18 damage. Exhaust 1 card at random.
  • Dark Embrace — Whenever a card is Exhausted, draw 1 card.
  • Expect a Fight — Gain 1 Energy for each Attack in your Hand. You cannot gain additional 1 Energy this turn.
  • Fiend Fire — Exhaust your Hand. Deal 7 damage for each card Exhausted.

Other cards with Exhaust

Where to go next

All 577 cards — the full table, filterable by character. Efficiency tier list — every measurable card ranked.

Rarity system explains how often this card appears. Enchantments covers the modifiers that can change it.

Frequently asked questions

What does Impervious do in Slay the Spire 2?

Gain 30 Block.

What does upgrading Impervious change?

Gain 40 Block.

How much does Impervious cost?

2 Energy. It is a Rare Skill card.

Is Impervious efficient for its cost?

It produces 15.00 Block per Energy, which ranks 1 of 56 among the skills that can be measured this way.

More Slay the Spire 2 guides

Sources

Figures and item data on this site are read from the game’s own reference wiki before publishing. Where a value could not be confirmed there, the page says so instead of filling the gap.