pf2e.fyi
From Pathfinder Lost Omens Divine Mysteries, which isn't enabled.

Flash of Omnipotence

FEAT 20
Activity free action
Archetype Mortal Herald

Trigger Your turn begins.

For but a moment you hold the power of a god. You spend a Mythic Point. Until the end of your turn, any damage you deal ignores all the target's resistance and immunities or triggers the target's highest weakness if they have no resistance or immunities.

Pathfinder Lost Omens Divine MysteriesORC