Powerful as the magic is in enabling death to immortal beings, they cannot keep them dead forever. A creature who dies remains dead from old age for 1 year/caster level. After this, they remain dead but can return with their usual respawn methods (such as a lich) or can be revived by normal means (as if they were killed and not dead of old age). A ''[[SRD:Wish|wish]]'' or ''[[SRD:Miracle|miracle]]'' can also reverse the death by old age effect, allowing them to be revived as normal.