pf2e.fyi
From Pathfinder Season of Ghosts Hardcover Compilation, which isn't enabled.

See You in Hell

FEAT 17
RAREREINCARNATED
Activity reaction
Frequency once per day
Trigger You're reduced to 0 Hit Points by a creature but not immediately killed.

You aren't sure if you'll be reincarnated again, so you might as well take this foe with you. A blast of spiritual energy lashes out from the depths of your soul, targeting the creature who attacked you. The creature takes spirit damage equal to the amount that reduced you to 0 Hit Points (basic Will save with a DC equal to your class DC or spell DC, whichever is higher).

Pathfinder Season of Ghosts Hardcover CompilationORC