While his attention was to fight back the Legion in the Scar, the Nathrezim, who had formerly resided there, took the chance to find and enter Madraz and corrupt Wormthorn's trance, making him go insane during the process. Losing his former self, Marl Wormthorn was trapped and his whole body was in control by the Legion and used as a weapon to corrupt the land rather than restoring it. That was when he was finally killed by Adventurers from the Alliance or Horde to prevent the forest from been tainted.