SpireForge

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

Lantern Key

Colorless · Quest · Quest · 0 cost

Base

Lantern Key

Upgraded

Lantern Key

Card text

Unplayable. Unlocks a special event in the next Act.

Lantern Key

Unplayable. Unlocks a special event in the next Act.

Keywords

Unplayable

Build context

Colorless cards splash into every class. Browse the Colorless card pool and pair it with any class build hub for archetypes that want it.

Related cards

Byrdonis Egg
Spoils Map
Ascender's Bane
Bad Luck
Burn
Clumsy
Curse of the Bell
Curse of the Bell
Dazed

Lantern Key FAQ

Should I upgrade Lantern Key in Slay the Spire 2?
Compare the upgraded text: Unplayable. Unlocks a special event in the next Act.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.
What builds use Lantern Key?
Lantern Key is tagged as a Colorless card. Colorless cards can be picked by any class.
What character uses Lantern Key?
Lantern Key is tagged as a Colorless card. Colorless cards can be picked by any class.

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.