Board Thread:Questions and Answers/@comment-24975288-20140916201210/@comment-1038387-20140916203635

Per the latest retcon, the Source Wall is the edge of the known everything. Beyond the Godsphere, beyond the Multiverse. It's traditionally a New Gods thing, any interaction post-Jack Kirby has been inconsistent. I'm not sure when Spectre almost merged with the Presence, but if it was Genesis (Event)... that was mostly ignored.

The Presence is, by editorial decree, the most powerful being/entity/whatever. We don't know that much about him as he rarely shows up.