Krona

Krona is a villain who first appeared in Green Lantern Vol.2 40. Ten billion years ago, Krona, one of the most brilliant of all the Maltusian scientists, decided to break the ancient edict and probe the origins of universe itself. Krona constructed a machine capable of piercing the temporal barrier and viewing the beginnings of time itself. As he watched time peel away, Krona caught a glimpse of the hand of creation depositing the speck that would become the entire cosmos. At that instant, his machine exploded and the universe was shattered. The universe then infinitely replicated itself. At this same moment, the Anti-Matter Universe was created, unleashing evil into the cosmos; thus, the Monitor and the Anti-Monitor were born. The Oans severely punished Krona for his misdeeds, turning him into a bolt of energy and sending him to forever wander the cosmos.