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You have trained with the masters of martial arts. While with them, you received instruction in the basics of how to use their unarmed style and how to channel ki.

Prerequisite: Strength 13 or Dexterity 13

Benefit: You gain training in Athletics or Acrobatics. You also gain the monk’s Unarmed Combatant feature and gain proficiency with ki focuses.

Dragon Mag 404 pg 42