Reactive Regeneration

Feats

Surgical skill beyond mortal comprehension has allowed kyton torturers to enhance this creature's flesh so as to prolong its suffering and prevent untimely death. Up to three times per day when the creature drops to 0 or fewer hit points, its body starts regenerating rapidly. If this regeneration is not interrupted before the start of the creature's next turn, the creature is restored to full hit points and gains one negative level. This process also grants the creature the effects of the haste spell due to a rush of adrenaline and the bone fists spell due to bone overgrowth. These effects cannot be dispelled.

Reactive Regeneration — Feats | Pathfinder: WotR Database