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

Preternatural Parry

FEAT 14
MAGUS
Activity reaction
Prerequisites Spell Parry
Trigger You're targeted by a Strike or a spell attack, or you're about to roll a saving throw against a spell effect.
Requirements You have one or more hands free.

You snap your weapon or limb into place to ward off harm. You gain a +2 circumstance bonus to AC and saving throws against the triggering effect until the start of your next turn.

Pathfinder Impossible MagicORC