Updated for Data 2026-03-17Early Access — numbers may shift with patches.
Breakthrough
Ironclad · Attack · Common · 1 cost
Base
Breakthrough
Upgraded
Breakthrough+
Card text
Lose 1 HP. Deal 9 damage to ALL enemies.
Breakthrough+
Lose 1 HP. Deal 13 damage to ALL enemies.
Builds that use Breakthrough
Archetypes that draft this card in real runs, with the role it plays.
Build context
See the Ironclad build hub for archetypes that feature this card in real runs.
Related cards
Breakthrough FAQ
- Should I upgrade Breakthrough in Slay the Spire 2?
- Compare the upgraded text: Lose 1 HP. Deal 13 damage to ALL enemies.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.
- What builds use Breakthrough?
- Breakthrough appears in 2 tracked builds: Bloodthirsty Rite of Rupture (B-tier, flex pick), Cruel Hand of Reckoning (B-tier, flex pick).
- What character uses Breakthrough?
- Breakthrough is tagged as a Ironclad card. See the Ironclad build hub for archetypes that care about it.
Patch history
SpireForge snapshots card text from Untapped exports dated 2026-03-17. When Mega Crit ships a balance patch, we re-run the scraper and refresh every affected URL—see /patches for the editorial log.