Rise of the Prim

From the dark tower wiki article on thePrim:

''The Prim is the primordial chaos that Gan (the spirit of the Dark Tower) originally rose from, spinning the universes from his navel. The six Beams also arose from the Prim. It has receded since the universe has progressed. During its recession many demons of the Prim became stranded on the shores of all the parallel worlds, being strangled by the air, however some adapted and survived''