He'd be a god able to control the flow of time, then something would go wrong, splitting it into two entities - one representing the god's consciousness, one representing his raw power.
Then there'd be a terrible game, with gratuitous amounts of loading screens and severly broken gameplay, between this premise and the eventual ending, during which the consciousness tinkers with time, manipulating several players into restoring his power, and the final boss fight would span the past, present and future. And it would be awesome.
After he's defeated though, the main protagonists will be transported back in time to a short while after the god's conception and extinguish his life force, preventing any of this from actually happening...
Seriously, Solaris was awesome. And Mephiles was an effin brilliant antagonist.