Gaea and Ouranos were the two original beings of the universe, created when magical energy congealed in an empty void. Gaea and Ouranos created The Nether Realm, in which they would live. The two immediately fell in love and birthed around 20 children, which would be known as the Giants. The Giants would goon to eventually rule the Nether Realm after they overthrew and killed their parents. Gaea and Ouranos's souls are trapped in Hell to this day, and their corpses have been made into The Physical Realm by Xbalanque and Hunahpu. While in Hell, Gaea and Ouranos produced the Oni Demons.