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Lantern Key — Quest Quest 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.
Lantern Key card art
Lantern Key

Unlocks a special event in the next Act.

CharacterQuest
TypeQuest
RarityQuest
Cost-1 Energy
TargetSelf
KeywordsUnplayable

Card text

Unlocks a special event in the next Act.

This card has no upgraded text in the card data, so it does not change on upgrade or the change is not text.

Other Quest cards at -1 Energy

  • Byrdonis Egg — Can be hatched at a Rest Site.
  • Spoils Map — Marks a site of 600 extra Gold in the next Act.

Other cards with Unplayable

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 Lantern Key do in Slay the Spire 2?

Unlocks a special event in the next Act.

How much does Lantern Key cost?

-1 Energy. It is a Quest Quest card.

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.