Guise

Guise lets you play as some of your favorite monsters. Choose from 16 unique skins across all 5 characters, each with their own animations, sound effects, and abilities. Victory animations take place after winning combats. Select your skin on the character select screen by pressing the Tab key over any character.

Place the mods
folder containing Guise folder
and its contents
into your Slay The Spire 2
Game Directory folder.

Guise: Skin Abilities And Passives
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An important note about mod load ordering:

BaseLib Load Order Notice
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Multiplayer crashing when using mods?

This is due to Mod Mismatching. The fix? All users simply install 

ModSync

Note: Mods that add cards, relics, or characters will still cause desyncs during gameplay even with ModSync installed. Both players must have identical content mods for stable multiplayer. ModSync works best with UI, cosmetic, and gameplay-modifier mods that do not alter game data.
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Please let me know if you have any questions and/or concerns; thank you.