So I'm really enjoying the new Ultimates run. But what I find a bit confusing is that in the 3rd issue Eternity contacts Lightbringer Galactus and says that the crew is going out of the Omniverse and beyond his influence. I was always under the impression that Eternity was the embodiment of Space and Time of 1 universe. So is he the embodiment of the Omniverse in ANAD, or how does that work? And is Omniverse different from Multiverse?

They start within the Universe that is Eternity and are traveling to outside the Omniverse. So Eternity’s statement makes sense.