pf2e.fyi
From Pathfinder #166: Despair on Danger Island, which isn't enabled.

Disrupting Strikes

FEAT 6
Activity 1 action
Archetype Ghost Eater

You call forth vitality energy from within to help you destroy undead. Your weapon and unarmed Strikes gain the effects of a disrupting property rune until the start of your next turn.

If you're 14th level or higher, your Strikes instead gain the effects of a greater disrupting property rune. The DC for the rune's effect is equal to your class DC or spell DC, whichever is higher.

Pathfinder #166: Despair on Danger IslandOGL