Board Thread:Warhammer 40k General Discussion/@comment-58.178.177.10-20140403083608/@comment-4851119-20140807164732

Boradzombiecreeper4 wrote: The machine spirits were replaced by daemons, now I remember. Yeah, fluff-wise they either have something called in "infernal device" serving same the role as a Machine Spirit or are outright possessed and controlled by a Daemon or Daemonic Beast.

Also there are several Daemons who have no particular God like Furies. Technically Furies are Daemonic Beasts but meh.

Many Daemons May serve the minor gods. Maybe, but also maybe not; Daemons are created from the essence of a Chaos God and it's possible that Minor Gods might not have enough essence to give away like that.