Impervious

Ironclad

A — Strong

SkillRare2 ⚡

Gain 30 Block. Exhaust.

Why A-tier:

Thirty Block in one card is a lifesaver against boss burst turns; Exhaust keeps it out of your deck the rest of the fight.

Best with:

Any deck, Boss fights, Exhaust payoffs

Ironclad burst defense

Impervious answers the turn that would end the run

Impervious is a compact panic button: a large Block card that exhausts. It is at its best when the deck can identify a specific boss or elite turn that needs one massive defense answer.

Pick it when

The next boss or elite has a large telegraphed hit that normal Block cards do not cover.
The deck has enough draw or retain-like planning to find Impervious when the danger turn arrives.
Exhausting after use is upside or neutral because the fight plan wants a smaller deck later.

Pass or delay when

The deck already blocks reliably and needs damage, draw, or scaling instead.
Two energy is too expensive for the turns where other key cards must also be played.
The main threat is many small hits over time, not one turn where 30 Block changes the fight.

Matchup notes

Against Corrupt Heart, Impervious can cover a decisive burst turn, but the deck still needs a way to win before attrition takes over.
Against Aeonglass, it can buy the turn needed to keep the damage race on schedule.
Against bosses with predictable spikes, treat Impervious as insurance you plan around, not as generic defense every turn.

Common misreads

Taking it as the whole defensive plan instead of one answer to one dangerous turn.
Playing it too early because the number is large, then lacking Block when the real hit arrives.
Ignoring that a rare two-cost Skill can be dead weight in fast hallway fights.

Compare Ironclad boss defense →