pf2e.fyi
From Pathfinder Impossible Magic, which isn't enabled.

Rapid Manifestation

FEAT 6
ARCHETYPE
Activity free action
Archetype Soulforger
Prerequisites Soulforger Dedication
Trigger You roll initiative or a hazard attacks you.

Your unwavering soul brings up your defenses as soon as you're in danger. You Manifest your Soulforged Armament.

Pathfinder Impossible MagicORC