I learned it like after the fourth there's another, transecting the fourth dimension and fifth, which represents travell in time, alternate time, travel between alternate time, infinaty, travel between infinaties and infinate infinaties.
Another fabled race, the Horduon. They where though to be their own species, much the same as the time keepers, a creature who could bend the laws of inter-dimensional travel. With a flick of thought, they could open a vortex to most any dimension. They where few and sparsely scattered, but they always came back to the halls of Cobiren, and the hall of doors.