From Pathfinder Lost Omens Hellfire Dispatches, which isn't enabled.

Masked Casting

FEAT 8

Activity free action

Prerequisites Hellknight Signifer Preferment

Trigger You begin Casting a Spell.

Requirements You're wearing your signifer's mask.

You harness the magical energy flowing through your eyeless mask to effortlessly protect you from visual effects. You Avert Gaze. While Averting your Gaze in this way, you also gain a +2 circumstance bonus to saving throws and checks to disbelieve illusions.

Pathfinder Lost Omens Hellfire DispatchesORC