Nioh 2 The First Samurai Switchglaive Boss Skill "Arc of Chaos"

From the final boss in the "Dawn of the Demon" mission.

[@defrand14able]

Thank u!!

[@lordofshadowz--1316]

Where is located ?

[@21akasaka]

Learn Skills Switchgave and there was a Yellow Exclamaton mark in the circle "Arc of Chaos" I clicked on it and followed the commands L1 + Triangle (Triangle while guarding}. I've tried several times and it doesn't seem to work. What am I doing wrong. Help

[@oters7]

Try to check your skill customization