I know the curse of which you speak. Dark magic that possesses the mind of the afflicted.
Long ago, the Drust were ruled by a sorcerer king named Gorak Tul. It was he who twisted our rituals and us upon the path of death and domination.
You will need to claim a portion of his power to break the curse.
Take this fetish to Gol Inath and temper it in the Flame of Oblivion. But beware... it is a vile place, and danger lurks among its shadows.