Originally Posted by
Kalium
The Burning Legion (aka the Legion, occasionally referred to as the Legion Forces, and the Burning Shadow or great burning shadow and the Infinite Army) is a vast, innumerable army of demons and corrupted races who seek to destroy all life. Sargeras created it with the purpose of destroying all world-souls in the universe in order to prevent the void lords from corrupting them, which would lead to the birth of a Dark Titan, a being of unspeakable evil that would utterly annihilate and consume the universe.
Chronicle Volume 1