Omega takes things from the void, in a sense. to put it in vague and more understandable terms, omega is essentially god, it can get data on anything that exists. or as far as i understand it. and the void feels more like a plot device (in every FF game ofc) to just bridge the worlds together without making the worlds physically exist together in canon, thats why gilgamesh can travel between worlds, and how the world of darkness got here and the same with ex death.
TLDR, omega can do anything because the void exists.
