Should I upgrade Unleash in Slay the Spire 2?

Compare the upgraded text: Osty deals 9 damage. Deals additional damage equal to Osty's current HP.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.

What builds use Unleash?

Unleash appears in 1 tracked build: Osty's Warband (A-tier, core card).

What character uses Unleash?

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

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

Unleash

Necrobinder · Attack · Basic · 1 cost

Base

Upgraded

Card text

Osty deals 6 damage. Deals additional damage equal to Osty's current HP.

Unleash+

Osty deals 9 damage. Deals additional damage equal to Osty's current HP.

Builds that use Unleash

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

AOsty's WarbandNecrobinder · Core card

Build context

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

Related cards

Unleash FAQ

Should I upgrade Unleash in Slay the Spire 2?: Compare the upgraded text: Osty deals 9 damage. Deals additional damage equal to Osty's current HP.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.
What builds use Unleash?: Unleash appears in 1 tracked build: Osty's Warband (A-tier, core card).
What character uses Unleash?: Unleash is tagged as a Necrobinder card. See the Necrobinder 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.