From Pathfinder Lost Omens Character Guide, which isn't enabled.

Aegis of Arnisant

FEAT 12

Activity 2 actions

Prerequisites Knight Vigilant Dedication; Shield Block; master in Religion

Requirements You are wielding a shield.

Inspired by the tale of Arnisant, you transform your shield into a magic ward. Until the beginning of your next turn, you gain the Absorb into the Aegis reaction.

Pathfinder Lost Omens Character GuideOGL