I've mentioned my theory on another thread, but here goes:
The Void is what existed before creation, and before the Wager. It is not emptiness, in fact, its the opposite: it is the primal chaos that contains the infinite possibility of existence. Its the realm where Gods, capital G, come from, insofar as they can be declared distinct beings from the realm. It is dangerous, but not because it is evil or hostile: its just too much for mere mortals to bear. The more you touch upon the Void, the more you are transformed by it, both in form and perspective.
Under this theory, Oblivaeon is one of the Void-born Gods. So is Jansa vi Dero, and also whoever else made the Wager, if Jansa isn't that being. Its also not coincidence that the Wager turned out the way it did, nor is it coincidence that except for Oblivaeon, all the Void-touched individuals are broadly positive influences on the Multiverse. In essence, the Void "wanted" Creation and the Multiverse to happen.
( To make an analogy, if this were Lord of the Rings, the Void-born gods are the Valar. Oblivaeon is Melkor/Morgoth. The Void is Eru. )