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Furnace — Regent Power 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.
Furnace card art
Furnace

At the start of your turn, Forge 5.

CharacterRegent
TypePower
RarityUncommon
Cost1 Energy
TargetSelf

Card text

At the start of your turn, Forge 5.

Upgraded: At the start of your turn, Forge 7.

Other Regent cards at 1 Energy

  • Arsenal — Whenever you create a card, gain 1 Strength.
  • BEGONE! — Choose a card in your Hand to Transform into Minion Strike.
  • Beat into Shape — Deal 5 damage. Forge X. Forges an additional 5 for every other time you've hit the enemy t
  • Black Hole — Whenever you spend or gain 1 Stars, deal 3 damage to ALL enemies.
  • Bundle of Joy — Add 3 random Colorless cards into your Hand.
  • CHARGE!! — Choose 2 cards in your Draw Pile to Transform into Minion Dive Bombs.

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 Furnace do in Slay the Spire 2?

At the start of your turn, Forge 5.

What does upgrading Furnace change?

At the start of your turn, Forge 7.

How much does Furnace cost?

1 Energy. It is a Uncommon Power 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.