Feast

You feast upon an adjacent restrained or unconscious creature, or a deceased creature that died in the past hour. If the creature is alive, you deal damage equal to your jaws damage. Whether it's alive or not, you gain a number of temporary Hit Points equal to half your level that last for 1 minute.

You can instead choose to gain temporary Hit Points equal to double your level, but if you do, you must succeed at a DC 6 flat check or your body deteriorates.