Originally Posted by
derpkitteh
So, light is partially responsible for their existence. sorry, i didn't mean to make it sound as absolute as i did.
"Not all demons are evil either, many are neutral such as the observers, who serve anyone that would allow them to observe the mysteries of the universe and feed upon all sorts of magic,[7] or the demons serving the Illidari and the Black Harvest against the Legion.
However, the vast majority of them joined the Fallen Titan Sargeras and his Burning Legion, with only one purpose: destroying all world-souls in the universe."
"Chaos, however, does not come easily to all demons - some struggle with the ways of the Burning Legion. That is why some carry an enchanted orb that invokes the rage required of any good demon. It is not known how the orbs are made, or who makes them.[22] Others decided to not follow the Legion at all and serve their own agendas, or band with like-minded people such as the Shivarra serving Illidan Stormrage against Sargeras."