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

Hungry Goblin

FEAT 9
GOBLIN
Prerequisites Fang Sharpener

You'll eat anything and anyone. Whenever you inflict Persistent Bleed Damage with your jaws unarmed attack, you gain temporary Hit Points equal to half your level for 1 minute.

Effect: Hungry Goblin

Pathfinder Lost Omens Character GuideOGL