In my universe's ancient past existed a duo of primordial gods, beings of anthropomorphism of the most barest of concepts. There was Oenui, architect of the universe, smith of its great form, and there was Paerii. Paerii, the mother of life, the mother of suns, and giver of life. Through the interplay of these beings, came a third, by the name of Dauh.
Dauh was the cautious, yet opportunistic primordial form of fate, disorder, chance, and time. This new being was said to be lovingly accepted into the arms of the others, and with them, they forged the first world. But, this was not to last, as this first world became the victim of Dauh's newfound insanity. Unable to comprehend its own vast form, it struck out against its creators in its existential dread, taking the world with it, shattering its form.
Eons saw the trio in conflict, the immature primal matter became their battleground, endless magics consumed. By luck, Oenui and Paerii gained the upper-hand in their conflict, shattering the form of Dauh, resulting in the seeding of the universe with their power. Time was fully established, as with death, and chance. But this victory was not to last, out of the remains of Dauh came numerous smaller beings, each an aspect of the primordial that came before them. These were a new unavoidable constant.
To save the universe from more endless conflict, Oenui and Paerii sought to create a new stable world, from this came the Worldplanes. Oenui laid out the groundwork, while Paerii dotted them with suns. To shape and finalise the Worldplanes, they were left with careful subjects, the E'onu, demi-god children. The E'onu forged the sub-planes, their own realms to watch the Worldplanes from, to keep watch in protection from the Dauh'ji, the eldritch old gods.
Due in-part to the magical protective auras laid down by the E'onu and their creators, most minor Dauh'ji are doomed to collapse when placing foot on the Worldplanes, like small blackholes, they evaporate, requiring vast amounts of anima, life energies, to sustain their forms. To achieve anima-feeding, they lure in weak-minded magi using their magics to feed on them. But, why do the larger Dauh'ji chose to avoid attacking their rival's creation directly?
The Worldplanes are made up of layers. The base layer is where the races, and life generally dwells. The Thoughtscape is where life gather their mana from through meditation, and where adventurous, or stupid otherworldly beings like Dauh'ji have risked communing with the aforementioned Magi from.
The Dream is the land of the gods, the home of the E'onu, and their own children, the elemental tribune (embodiments of the elemental forces), and where the gods watch over the Worldplanes.