Antewise

Unrelenting — Ironclad Attack 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.
Unrelenting card art
Unrelenting

Deal 14 damage. The next Attack you play costs 0 1 Energy.

CharacterIronclad
TypeAttack
RarityUncommon
Cost2 Energy
TargetAnyEnemy
Total damage14
Per Energy7.00 → 10.00 upgraded

Card text

Deal 14 damage. The next Attack you play costs 0 1 Energy.

Upgraded: Deal 20 damage. The next Attack you play costs 0 1 Energy.

Where it sits on the curve

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

Unrelenting produces 7.00 per Energy at base and <strong>10.00</strong> upgraded. That ranks it 84 of 143 of the 143 attacks with a fixed cost. It sits in the top 42% 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.

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 Unrelenting do in Slay the Spire 2?

Deal 14 damage. The next Attack you play costs 0 1 Energy.

What does upgrading Unrelenting change?

Deal 20 damage. The next Attack you play costs 0 1 Energy.

How much does Unrelenting cost?

2 Energy. It is a Uncommon Attack card.

Is Unrelenting efficient for its cost?

It produces 7.00 damage per Energy, which ranks 84 of 143 among the attacks 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.