Should I upgrade Thunderclap in Slay the Spire 2?

Compare the upgraded text: Deal 7 damage and apply 1 Vulnerable to ALL enemies.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.

What builds use Thunderclap?

Thunderclap appears in 1 tracked build: Cruel Hand of Reckoning (B-tier, core card).

What character uses Thunderclap?

Thunderclap is tagged as a Ironclad card. See the Ironclad build hub for archetypes that care about it.

Updated for Data 2026-03-17Early Access — numbers may shift with patches.

Thunderclap

Ironclad · Attack · Common · 1 cost

Base

Upgraded

Card text

Deal 4 damage and apply 1 Vulnerable to ALL enemies.

Thunderclap+

Deal 7 damage and apply 1 Vulnerable to ALL enemies.

Builds that use Thunderclap

Archetypes that draft this card in real runs, with the role it plays.

BCruel Hand of ReckoningIronclad · Core card

Keywords

Vulnerable

Build context

See the Ironclad build hub for archetypes that feature this card in real runs.

Related cards

Thunderclap FAQ

Should I upgrade Thunderclap in Slay the Spire 2?: Compare the upgraded text: Deal 7 damage and apply 1 Vulnerable to ALL enemies.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.
What builds use Thunderclap?: Thunderclap appears in 1 tracked build: Cruel Hand of Reckoning (B-tier, core card).
What character uses Thunderclap?: Thunderclap 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.