Regrow severed body parts and ruined organs, repair broken bones, and heal other damage through a spell, magic item, magical effect, or extraordinary ability. Severed body parts that are not reattached simply die, and the regenerating creature grows replacements at a rate specified in the individual spell or monster description. Most damage dealt to a naturally regenerating creature is treated as subdual damage, which heals at a fixed rate (see individual creature descriptions). However, certain attack forms (typically fire and acid) deal damage that does not covert to subdual damage. Such damage is not regenerated. Regeneration does not alter conditions that do not deal damage in hit points, such as poisoning or disintegration.