At the start of the Dawn Era, there was only the Sea of Entropy and the stars outside of it. The Sea of Entropy, often referred to as Chaos, is a vast area of the Void, the center for entropic energy, islands of matter - some as big as moons, a multitude of energy types, and all the building blocks necessary for building worlds and girding them with life. The stars were then empty systems, with no worlds.
Like what is believed to have transpired during the Lost Ages, the era preceding the dawn of time, stars became anchors for Negative Entropy. Their presence pushed back against the forces of Chaos. When Creationists began crafting worlds around these celestial bodies, a great conflict ensued. This Creation War (1486 DE - 8777 DE) endured for seven millennia. The defeat of the primordials meant that Nawirrûs, all that exists beyond the Sea of Entropy, is here to remain... at least as long as the Primordial Lords are kept at bay.