SFS Standard Consume Flesh [one-action] Feat 5

Frequency once per day
Requirements You are adjacent to the corpse of a Small or larger creature who has died in the last day.

Your undead metabolism has evolved in ways that allow you to gain some small measure of sustenance and healing from the consumption of the recently dead. This might be the act of eating their flesh, fusing their bones with yours, or a combination of other activities that your companions might find to be gruesome. Regardless, it nourishes and replenishes you. You regain 1d6 Hit Points for every level you have.