FrendlyFire

What it does

• Unifies the save directory for modded and vanilla play
• Character unlocks, epoch progress, and run history are shared across both modes
• No gameplay content is modified — only the save path routing is changed

How it works
Once in combat, hold the trigger key(default key is ALT) to drag cards onto allies or enemies, allowing their effects to apply accordingly—secretly give enemies Block or Powers, or smack your teammates when they least expect it.   When you hold the trigger key, a red box will appear at the top of the screen indicating that the feature is currently active.

Installation

• Extract the zip into your game's mods/ folder (e.g., Steam\steamapps\common\Slay the Spire 2\mods\)
• You should have a directory named 'FrendlyFrie' in the mods folder
• Launch the game and click "Yes" when asked to load mods
• Change hotkey or other settings via friendly_fire_config.cfg

Note: In multiplayer, all players must use the same configuration file. Different settings may cause game data to go out of sync and result in disconnections. 
 
Maybe need to install https://www.nexusmods.com/slaythespire2/mods/103 first

https://github.com/SWBaJiao/FrendlyFire-StS2
Parts of the code were written with the assistance of Claude.

Sorry for my poor English!!!!!!!!