DESC: Regenerate 1 or more life points per round for -5000 population until you reach your full amount of life points yo have. Note that any damage you take from a weaknesses is not healed by your regeneration, it is healed normally like a person without regeneration.
Regardless of how much damage you take you will always be able to recover in time. Unless the damage you take is from a weakness (or vulnerability) and totals your life points or you take a total of (5 x your life points) in damage.
If part of your body is severed you will only regrow the lost part. You will not grow a clone of yourself, you do recover with no scarring.
You may never gain a benefit during racial build or in game that over rides your vulnerability (immunity to acid when you have a vulnerability to acid). Items and spells that provide protection are OK.