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

Oni Rampage

FEAT 13

Activity reaction

Frequency once per day

Trigger You're reduced to less than half your maximum Hit Points by a creature within your reach.

Nothing invigorates you more than your own freshly spilled blood. You gain the effects of Haste for 1 minute.

Pathfinder Lost Omens Tian Xia Character GuideORC