A fan of Marvel, and a former USA army soldier goes on an adventure.
The One Below All is the direct opposite counterpart of the One Above All. This has radically altered Marvel's cosmology since this makes the One Below All Marvel's first Anti- God and as such, it is the unequaled embodiment of destruction, wrath and ruin.
The One Below All is also the true power behind the mutagenic factor of the gamma radiation mutates, Hulk is obviously the most famous and most powerful. It was this very revelation that drove Brian Banner as he believed his son carried a monster gene, having caught a glimpse of the One Below All during her own experiment's into gamma radiation.
So far, Maggie Shaw has no true form, but she has very brief appearances where she can take seemingly any form she desires, though she favors the use of extremely abstract and beautiful visages.
There's no doubt that Maggie Shaw could further play her dreaded reputation as the true Goddess of the Marvel MCU universe.
Despite her Goddess nature, Maggie Shaw's apparent true form is actually the Goddess of creation, which is very likely symbolism to the One Above All's nature as both of an embodiment of creation and the hidden, malevolent intellect behind the mutagenic nature of gamma radiation in the Marvel Universe.