Omega

Omega is a fictional DC Comics entity created to be the physical embodiment of universal hate. Omega first appeared in Superboy and the Legion of Super-heroes vol. 2, #250 (April 1979), and was created by Jim Starlin (as Steve Apollo), Paul Levitz, and Dave Hunt. In their early history, the Legion of Super-Heroes defeated a renegade Controller, and as a reward were gifted with a Miracle Machine, a "simple" (to the Controllers) device that turned thoughts into reality. At the time, Brainiac 5 cautioned that it was dangerous, as if someone rashly wished to be dead for a second, they would be. The Legion locked the machine inside a solid block of Inertron and hid it in their vault. Some years later, Legion member Brainiac 5 went insane (originally due to stress, a later retcon suggested it was induced by Glorith). Feeling he had never been sufficiently compensated for the many times he had saved the cosmos, in his insanity he decided to destroy it as payment. Retrieving the miracle... full article at wikipedia