Wolfeinstein His brother and the 3rd fate witch(dont' remember her name...) are actually clones of Wizard god Lance.... And Hathaway is actually the personification of the world will of the main world( and the true villain in the novel).
The thing is that the when Lance was out in the cosmos exploring the further worlds, some aliens attacked the present world(again.. I don't remember the name of the main world).. the night monarch along with other friends of lance fought them and after the arrival of lance they were successful in defeating them... these aliens(*cough Magus) planted a seed of evil in the heart of the world which sparked the curiosity and greed in the core for the multiverse... this lead to the slow and eventual decline as the night monarch and Lance set up a huge plan for the birth of an overgod, when everything was going on, Lance and night monarch went out to look for a time-bending artifact, while the worl ddescended into chaos(by foolish gods .... which were actually affected by the world will to break the universe pool which was actually a seal on the evil seed by the aliens... giving powers to the wizards were just a side job to ignore the main function of Universe magic pool)
Knowing that the world can't be saved night monarch and lance started the project and by a huge sacrifice they were able to send Lance back in time, which then in turn carrying the whole history of what happened in the first timeline arrived in the MC's world as a game designer, he searched for a perfect candidate with enough knowledge and smarts to even rival him... and here we have Marvin who succeeded. The Timeline 1 lance then merged with the world will of the main world after bringing MC over while his clone lived by MC's side....
As for the timeline 2 Lance(The present timeline) after knowing everything for Lance 1, he went on a journey to find a cure for this curse(that's why he is not present in the present time).
I don't remember what happened to Night Monarch 2 though,,,,,,
It had been a long time since I read that.