STS2 Subclasses Mod

Future updates will be released exclusively through the Steam Workshop. The Nexus Mods version will no longer be updated.

Please subscribe to the Steam Workshop version to receive the latest fixes and features:

https://steamcommunity.com/sharedfiles/filedetails/?id=3747829352

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💬 Community Discord

Bug reports, balance feedback, mod chat — all welcome. EN/JP both fine.

バグ報告・フィードバック・雑談歓迎、英日どちらも OK。

→ https://discord.gg/BjjAdjRdHz

Sts2ClassAbilities is out — the companion that adds preset-specific Ultimates and Tacticals to every starter deck in this mod. 36 signature moves, painterly per-cast cinematics, full multiplayer sync. Balance feedback welcome.

→ STS2 Class Abilities on Nexus https://www.nexusmods.com/slaythespire2/mods/656

Wiki (EN/JP): https://wikiwiki.jp/sts2_starter/

Last updated: v0. 1. 7 — 2026-04-26

What's new in v0. 1. 7

- Fixed MP issue: starter relics (PocketedSleeves, ScorpionStinger, AnvilShard) no longer misfire on the friend's character — they now compare by NetId/CombatId instead of object reference.

- Fixed MP desync: added wrappers on 6 transient relic flags (AshenHeart, AsteroidCore, IronCore, PocketedSleeves x2, RuggedGauntlet) so BaseLib's checksum routine includes them. Without these, host/joiner state hashes diverged whenever the flags ticked.

- Conductive Claw: removed the per-turn claw rebound effect — that mechanic now lives on the Claw Prime tactical in Sts2ClassAbilities v0. 3. 3 (gated on tactical usage rather than passive-on-relic).

Description

Supports in-game language localization in Japanese, English, and Simplified Chinese for UI text, preset labels, deck descriptions, and all custom card / relic text.

Sts2StartingDeckSelect lets you pick a starter deck preset for each character before a run begins. The goal is to add meaningful early-build choice while preserving the original game flow and overall balance feel.

Current content:

- 25 custom cards across all 5 characters

- 17 custom starter relics tuned to each preset archetype

- 21 starter deck presets total (3–5 per character — Ironclad / Silent / Regent / Necrobinder / Defect)

- Each non-vanilla preset is paired with a thematic starter relic swap for stronger identity

- Ascension effects (including Ascender's Bane on A5+) apply correctly on top of the chosen preset

The mod is built with multiplayer in mind and includes:

- Host-driven selection flow

- Synchronized preset state across all players

- Deterministic starter deck setup (no after-the-fact deck mutation) to avoid combat-start