SRD:Ring of Regeneration
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Regeneration: This white gold ring continually allows a living wearer to heal 1 point of damage per level every hour rather than every day. (This ability cannot be aided by the Heal skill.) Nonlethal damage heals at a rate of 1 point of damage per level every 5 minutes. If the wearer loses a limb, an organ, or any other body part while wearing this ring, the ring regenerates it as the spell. In either case, only damage taken while wearing the ring is regenerated.