Antewise

Fasten — Colorless 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.
Fasten card art
Fasten

Gain an additional 4 Block from Defend cards.

CharacterColorless
TypePower
RarityUncommon
Cost1 Energy
TargetSelf
TagsDefend

Card text

Gain an additional 4 Block from Defend cards.

Upgraded: Gain an additional 6 Block from Defend cards.

Other Colorless cards at 1 Energy

  • Alchemize — Procure a random potion.
  • Anointed — Put every Rare card from your Draw Pile into your Hand.
  • Automation — Every 10 cards you draw, gain 1 Energy.
  • Beacon of Hope — Whenever you gain Block on your turn, other players gain half that much Block.
  • Coordinate — Give another player 5 Strength this turn.
  • Discovery — Choose 1 of 3 random cards to add into your Hand. It's free to play this turn.

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 Fasten do in Slay the Spire 2?

Gain an additional 4 Block from Defend cards.

What does upgrading Fasten change?

Gain an additional 6 Block from Defend cards.

How much does Fasten 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.