Once there was nothing then a single universe started existing
choices were inveted, making it into a multiverse
(smaller choices dont create other realities, on a continental scale atleast)
then dimensions were made, growing that one multiverse more
and when it finally died, all the souls became other universes, making a cycle
the biggest and oldest one is made by the god of the first multiverse (fun fact its ours so its locked)
but some souls became evil or smth and became eaters
basically multiverse killers
so yeah thats it i guess