Baaledor

As the Demon Lord Baaledor rises from the ashes of the devout cultists that summoned him, a new source of Aughmoore's sickness is revealed. Through a dark covenant, cultists sapped the world of its energy, binding it instead to the merciless heart of their infernal liege. Through this enchantment, he absorbs all Mana, a process that can only be reversed when his heart ceases to beat.

Thus, it was Baaledor who began the world sickness that led to the Great War. As he watched the mortal races turn on each other in battle only to kill the planet even faster than the great demon lord could himself, Baaledor could only laugh with sadistic pleasure.