Curse Magic

Curse Magic (呪法, Jūhō) is a type of Magic where the user orders the Black Rukh that produce Magoi to change into Curse Magic. Curse Magic is a sub-type of the eighth type of magic, Life Magic.

Description
Curse Magic allows Mages to possess a person's blood vessels and turn their Rukh into the black if it is white. They will then be reborn as a new person because there exist no one without darkness. Ithnan stated that if you try to oppose the change, Solomon's Rukh and the Black Rukh will destroy each other in the person's body and their flesh will rot. People who are already fallen into depravity (or half fallen) are able to resist against this type of Magic and remove it from their bodies.

Trivia

 * This Magic was never officially named, just mentioned as a "Curse".