This is not an alternate reality at all. In fact, it's the primordial reality of all realities itself. It's a place that's so high that every universe is born as a bubble as well that when a bubble pops in Uphogoth, it means that a universe has either died from natural causes or from some other causes like the destruction of a universe itself. It is home to a race of primordials who have always existed in Uphogoth as well as the fact that they are Lovecraftian in nature.
They are a mysterious race of 'humanoids' that are so powerful, that they can't be harmed unless it's by a member of their own kind. They are so alien and beyond any form of comprehension, that they will drive any other being, with the exception of themselves, into utter madness and deranged insanity. The Primordial are beings composed of only strange darkness, which is makes no sense whatsoever, but then again, they are beyond our comprehension of realities itself. They are neither good nor evil, but in fact, seemingly all-powerful and all-knowing neutrals with amoralistic beliefs and views of every universe in Uphogoth.
Powers and abilties
Omnipotence: They are so powerful, that they can't be harmed unless it's by a member of their own kind. They can do absolutely anything they want, even if it's paradoxical in nature.