Regeneration

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Regeneration is a trait where a creature heals at a supernaturally fast rate and/or with supernaturally high levels of efficiency. A creature capable of regeneration can heal from massive amounts of damage, potentially recovering from even such extreme injuries as as severed limbs or removed organs.

In Dungeons & Dragons 3rd Edition, regeneration is broken into two traits: regeneration proper, which turns all incoming damage into nonlethal damage unless it comes from a specific source that inhibits the regeneration (and may even allow severed limbs to be reattached or regrown), and fast healing, which is just "recover X hit points at the beginning of your turn."

Most playable splats in the World of Darkness games have some mechanism to supernaturally heal damage. Kindred spend Vitae to heal one point of bashing or lethal damage per turn or five points per day to heal one aggravated damage, Garou naturally heal bashing and lethal one point per turn and aggravated one per day, and Mages use Life 3 to heal wounds at the cost of Paradox, while healing aggravated also requires spending Quintessence.