Forerunners, Precursors, Reapers, the Imperium of Man (wh40k). [spoiler]Reapers indoctrinate Imperium. Precursors use neural physics and stuff to assume control of Reapers. Forerunners support Precursors. Man gets tech fixed up and gain title of Reclaimers, Reapers invade the Warp and indoctrinate everything, resulting in a 'calming' phase (reverting to [Place name to do with souls?] ). Precursors leave galaxy and go to sleep in a holiday mini-galaxy. Forerunners build Halo Array (improved, designed with ability to focus on one species or type of, can be focused into a local area blast < galaxy for less genocide) then sit in Shield Worlds while Mankind is dealing with everything (see 'If the Emperor had text to speech...' for an idea).[/spoiler]