pf2e.fyi
From Pathfinder Fists of the Ruby Phoenix Hardcover Compilation, which isn't enabled.

Sixth Pillar Dedication

FEAT 10
Archetype Sixth Pillar
Prerequisites Dexterity +2; expert in Acrobatics; able to cast spells

You use your physical discipline to channel your magic. If your proficiency rank in unarmed attacks is at least expert, your proficiency rank in spell attacks increases to expert. Likewise, if your proficiency rank in spell attacks is at least expert, your proficiency rank in unarmed attacks improves to expert. You become an expert in Athletics, or in another trained skill if you were already expert in Athletics.

Sixth Pillar

Pathfinder Fists of the Ruby Phoenix Hardcover CompilationOGL