Patch Notes - v0.99.1

✦AI summary10h

Patch v0.99.1 focuses on stability, fixing numerous softlocks and crashes, particularly in multiplayer, alongside localization improvements and a modding structure rework.

▲Buffs4

Fairy in a BottleFixed relic not healing the player when Max HP is 1.
Lizard TailFixed relic not healing the player when Max HP is 1.
Hand DrillFixed Hand Drill incorrectly applying Vulnerable to the player when a Burn card breaks block.Player→Removed
TezcataraBrightest Flame:Fixed Brightest Flame being able to reduce player Max HP below 1.< 1→1

✚Bug fixes3

IroncladHellraiser:Fixed Hellraiser playing Strikes when no valid targets are present.
Multiplayer
- Fixed numerous softlocks including Potion Belt/Alchemical Coffer interactions and death-related state divergences.
- Fixed host and client sometimes generating different maps from the same seed.Different→Same

◆Other changes2

GeneralCapped maximum HP for players, enemies, and pets at 999,999,999.999,999,999+→999,999,999
ModdingReworked mod structure to make JSON the primary declaration file and moved manifest outside of PCK.PCK required→JSON required

subjects affected (8)

tap to see balance history

General1 Ironclad1 Fairy in a Bottle1 Lizard Tail1 Hand Drill1 Tezcatara1 Multiplayer2 Modding1

How did this patch land?

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official notes

Slay the Spire 2 · Mar 17, 2026

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