- Reverse Conversion
- Transformative Negation
- Transformation Undoing
The user can transform other beings back into their original species; for example, the user can turn a vampire back into their original species, or reverse a non-hereditary werewolf's lycanthropy.
- Magic Negation
- Power Erasure
- Shapeshifting Negation
- Spell Negation
- May not work on users of Regenerative Healing Factor.
- May be constantly active and uncontrollable.
- Does not work on beings who are not the result of some form of Conversion; e.g. someone who was born a vampire rather than turned, or someone who was built as a robot rather than roboticized.
- Wolfsbane (Folklore); reverts lycanthropy
- Lotus Rice (Chinese Folklore); cures Chinese vampirism
- Devamper (Sanctuary)
- Gamma Cure (Hulk)
- The Uninventing Ray (The Secret Show)
- The Cure (The Vampire Diaries); reverts vampirism
- The Cure (My Babysitter's a Vampire); reverts lycanthropy
- Purified Blood (Supernatural); reverts demons
- Cure for vampirism (Supernatural)
- Retromutagen Ooze (Teenage Mutant Ninja Turtles); reverts mutants into their original non-mutated forms.
- Glenmoril Witch Heads (The Elder Scrolls V: Skyrim); reverts lycanthropy
- Moon Pool (H2O: Just Add Water/Mako Mermaids); can turn merpeople back into humans and vice versa
- Mystic Falls (The Vampire Diaries); temporarily surrounded by a magic-negating field that could revert vampires and hybrids to their original state