You gain the class features and proficiencies of a 13th level Monk, but not its ability score improvements. You only get this classes hit die if your current classes hit die is lower than a d8.
You gain proficiencies in the following:
Proficiencies
Armor: None
Weapons: Simple weapons, shortswords
Tools: Choose one type of artisan’s tools or one musical instrument
Saving Throws: Strength, Dexterity
Skills: Choose two from Acrobatics, Athletics, History, Insight, Religion, and Stealth
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