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Card Guide

Impervious

Cost: 2RareSkillIronclad

Card Effect

Gain 30 Block.

30

Block

Upgrade

block: +10

Keywords

Exhaust

When to Pick Impervious

Impervious is a 2-cost skill card for the Ironclad. It provides 30 block. 30 block is premium defense for surviving big enemy turns. Pick this when your deck needs defense.

When to Skip

Skip this card when your deck already satisfies its role. Adding it past that point only dilutes your draw.

Upgrade Value

Medium upgrade priority. Block +10 — a modest but useful improvement.

Synergies

  • Exhaust: Demonic Shield, Dominate, Feed

Is Impervious worth taking?

A-Tier · Emergency defense

Impervious is the biggest single block card the Ironclad has: 30 block for 2 energy, or 40 upgraded. It exhausts, so you get one use, but that one use routinely saves a run against a boss or elite.

Numbers and upgrade

StatBaseUpgraded
Cost22
Block3040

Upgrade changes: Block +10

How to play Impervious

  • Save it for the turn you cannot otherwise survive. Spending it on a small hallway hit is usually a waste of the card’s real purpose.
  • Play it before you know the exact incoming damage only when the alternative is death. Otherwise, hold it and let cheaper block cover the small turns.
  • Upgrade it if the run is defensive. Ten extra block is a meaningful breakpoint against act 3 attacks.

Common mistakes

  • Treating it as your everyday block card. It exhausts, so you cannot rely on it every turn.
  • Playing it on a turn where a cheaper block card would have been enough. The card is a safety net, not a routine play.

Cards that work with Impervious

Impervious is strongest when its exhaust is a feature. Feel No Pain and Dark Embrace turn the one-time block into extra block or cards, and Barricade keeps the block around.

BarricadeBlock is not removed at the start of your turn.Feel No PainWhenever a card is Exhausted, gain 3 Block.Dark EmbraceWhenever a card is Exhausted, draw 1 card.Shrug It OffGain 8 Block. Draw 1 card.

Where to get Impervious

Impervious is in the Ironclad rare pool. It can appear in card rewards after combat, in shops, and in events that generate cards. Elites and bosses do not guarantee it, but they usually improve your odds of seeing higher-rarity cards.

Builds that use it:Ironclad Exhaust Control

Impervious FAQ

Is Impervious good in Slay the Spire 2?

A-Tier · Emergency defense. Impervious is the biggest single block card the Ironclad has: 30 block for 2 energy, or 40 upgraded. It exhausts, so you get one use, but that one use routinely saves a run against a boss or elite.

What does Impervious do?

Gain 30 Block. Its base cost is 2, it is a Skill, and it sits in the Rare rarity.

Should I upgrade Impervious?

Medium upgrade priority. Block +10 — a modest but useful improvement. Upgrade changes: Block +10。

How do I get Impervious?

Impervious is in the Ironclad rare pool. It can appear in card rewards after combat, in shops, and in events that generate cards. Elites and bosses do not guarantee it, but they usually improve your odds of seeing higher-rarity cards.

Which cards work well with Impervious?

Impervious is strongest when its exhaust is a feature. Feel No Pain and Dark Embrace turn the one-time block into extra block or cards, and Barricade keeps the block around. Cards to look for: Barricade, Feel No Pain, Dark Embrace, Shrug It Off。

What are common mistakes with Impervious?

Treating it as your everyday block card. It exhausts, so you cannot rely on it every turn. Playing it on a turn where a cheaper block card would have been enough. The card is a safety net, not a routine play.

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