Homorphus Charm

"Simple, yet effective - and another village will remember me forever as the hero who delivered them from the monthly terror of werewolf attacks."

- Lockhart bragging about his supposed use of this spell to end a village's terror

The Homorphus Charm was described by Professor Gilderoy Lockhart as what he used to cure the Wagga Wagga Werewolf. He described the spell as being "immensely complex." He later admitted to having stolen the credit from an Armenian warlock.

Since Lockhart is known for providing phony spells, and given that there is no known cure for Lycanthropy, it is possible that this spell does not truly exist or that it has a different effect than Lockhart described (possibly just temporarily forcing a transformed person back into human shape, rather than preventing the change).

Etymology
Homorphus is a combination of the Latin Homo meaning 'man' and the Greek morphe- meaning 'shape' or 'form'.

Behind the scenes

 * Although this spell is described as a charm, its effects seem closer to Transfiguration.
 * It is possible that this is the Animagus reversal spell that Sirius Black and Remus Lupin used to force Peter Pettigrew to reveal his true form in June of 1994, given the apparent similarities between an Animagus and a Werewolf and Lockhart's apparently non-existent magical knowledge.

Appearances

 * Harry Potter and the Chamber of Secrets