Disease. It's an obscure type of Dark Arts, largely unknown even in the dark professional circles.
This spell doesn't require substantial Spirit Power, but it does require immense Spirit Power and a complex mantra. The elaborate mantra invokes forbidden exchange orders, through which Dark Arts can swap portions of the Natural Force. This mantra serves as the entry point into Dark Arts, much like the dark symbols of Dark Alchemy. Mastering the mantra of a Dark Wizard is a sign of the transition from a Wizard to a Dark Wizard. Dark Wizards are in a different league from Rogue Wizards, who merely seek shortcuts; Dark Wizards have stepped entirely into the sanctum of darkness.
