From Pathfinder Lost Omens Knights of Lastwall, which isn't enabled.

Prayer-Touched Weapon

FEAT 4

Activity free action

Prerequisites divine spells; you follow a good-aligned deity

Frequency once per turn

Requirements Your most recent action was to cast a non-cantrip divine spell.

You coat a weapon you're wielding in prayers and the divine power given to you by your deity. Until the end of your turn, the weapon deals an extra 1d6 vitality damage. As usual for vitality damage, this damage harms only undead and creatures with void healing.

Pathfinder Lost Omens Knights of LastwallOGL