Skymods

Slay the Spire 2 Mods Catalogue

Heart of the Spire

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Author: Boninall

Last revision: 12 Jul at 02:05 UTC

File size: 18.27 MB

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Description:

[Version compatibility – 2026-07-12]
– Both the default branch (game 0.107) and the beta branch (game 0.108) are served v0.3.6 — Steam matches the build to your game version.
– If the mod reports "requires a newer game version" or fails to load, restart Steam to refresh Workshop content to the revision matching your game version.

Update – v0.3.6
  • The door animation now plays an insertion sound as each of the three key fragments slots in (STS1’s per-lock sound).
  • The Spire Shield & Spear fight now keeps the Act 4 BGM instead of switching to the elite theme (STS1-faithful — in StS1 that track only ever played when a Lagavulin woke up).
  • Co-op difficulty softened: the multiplayer multiplier on Act 4 enemy HP / block / defensive buffs is now sub-linear (2p ×1.9, 4p ×3.7, 6p ×5.5 — was ×2.4-×7.8).
  • Fixed the Sapphire Key never appearing in treasure chests in 5-6 player lobbies (player-cap-remover mods), which made Act 4 unreachable.
  • Fixed vanilla Fur Coat bleeding across acts — picked up in an earlier act, it could set Act 4 elites / the boss to 1 HP at combat start.

Heart of the Spire

Adds Slay the Spire 1’s true ending to StS2 as a standalone 4th act — collect the three keys, descend past the Architect into the Corrupt Heart’s chamber, and face the original game’s final boss.

Core gameplay
  • Three keys — the Ruby Key (from a campfire’s "Recall" option), the Emerald Key (dropped by a burning elite), and the Sapphire Key (taken from a treasure chest in place of a relic). A top-bar key slot tracks your progress.
  • Descend to Act 4 — with all three keys, an unlock-door animation plays after the Architect and you descend into the Corrupt Heart’s chamber.
  • Spire Shield & Spire Spear — the elite duel before the chamber.
  • The Corrupt Heart — StS1’s final boss: Invincible, Beat Of Death, multi-hit Blood Shots, the 15-hit Echo, and heavy debilitating debuffs.

Compatibility
  • Adds a standalone 4th act; it never changes the normal run and can only trigger after you clear the final act.
  • Save / continue is supported. Multiplayer is implemented but not yet thoroughly play-tested.

Author: @boninall (Bilibili)
Intro video: https://www.bilibili.com/video/BV1B8NuzHEfe

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