Eyyath, the Primordial Serpent of the Worlds Picture
Eyyath, in my personal mythology, is the serpent who dwells in the dark waters of pre-creation. He is the only being that can survive the waters, which dissolve created beings back into nothingness. His very presence boils the waters with unbalanced creative power, giving rise to more-or-less transient colonies of asymmetrical parasitic creatures that wreak havoc should they escape into the ordered cosmos. A portion of the pre-creational ocean lies beneath the palace of Dhegmon, the god of death, who is Eyyath's sole company-- in this universe anyway. Eyyath branches infinitely into the other created worlds in ways that are impossible (but that I may try to draw anyway).