Butterfly Blade Dedication
FEAT 4 trained in butterfly swords
Defeat a member of the Butterfly Blades in a sanctioned bout.
You become trained in Deception and Stealth; if you were already trained, you become an expert instead. Whenever your proficiency rank in any weapon increases to expert or beyond, you also gain that new proficiency rank with butterfly swords. You gain access to butterfly swords.
Pathfinder #166: Despair on Danger IslandOGL