Or he did ascend to Godhood, but is not considered as significant enough of an entity to add to the sourcebooks lol...
The sourcebooks don't know everything that goes on.... If ascended to Godhood, heck I would check out other realms or planes first... maybe spend a few millennia creating my own plane of existence.... whatever lol
My character ascended to godhood. Not as the god of murder, but as the god of red rum.
