Overmonitor is a gigantic vast intelligence named Monitor but referred to in places as "Overmonitor" or "Overvoid", discovered the Bleed and the DC Multiverse within, a 'flaw' at its heart.
In the beginning, there was only Overmonitor. Until he discovered a multiverse (to him, the multiverse is germ size) that had been created by another multiversal race. He sent a probe to explore the multiverse that he had discovered. To make sure that the multiverse is not destroyed by someone, he made a shelter, The Bleed, and a giant Thought Robot.