Fast Healing (Ex)
The creature regains hit points at an exceptionally fast rate, usually 1 or more hit points per round. Fast healing stops working when a creature is reduced to –10 hp or fewer. Except as noted here, fast healing works just like natural healing.
Fast healing doesn’t provide any benefit against attack forms that don’t deal hit point damage. Fast healing also doesn’t restore hit points lost to starvation, thirst, or suffocation, and it doesn’t allow a creature to regrow or reattach severed body parts.