Ring of regeneration
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In the Dungeons & Dragons role-playing game, a ring of regeneration is a famous type of magical item, which bestows magical ability of regeneration upon its wearer. Because of the way that Dungeons & Dragons handles regeneration, the wearer is essentially immortal.
Regeneration allows successful reattaching of severed limbs or regrowing them. Rings of regeneration can be given different levels of power by the Dungeon Master. The magnitude of their regenerative abilities is given as a numerical value, which represents the number of hit points regained per combat round, or six seconds.
A lesser form of regeneration that does not allow the regrowth of lost limbs is called fast healing.