Sometime when Time began, the first superintelligent species appeared, that being the pure plasma species of the Aureliens.The species was able to explore and conquer their Multiversal cluster rather fast via their means of producing God Particles: the way they found such secrets is lost to time, though the most likely answer is that they recreated conditions to fabricate the God Particles. They were able to conquer, explore and map the good part of the still cooling realities and higher dimensions. But overtime, their political differences on what they should do began to pop up: do they stop any life from springing up to make sure their hegemony is kept or do they allow life to flourish? Alongside the research into the God Particles, smaller, less powerful forces would pop up from it and this caused infighting within the Empire on which force is better: so it collapsed.
The Aurelien Civil War later on would make a hyper dimensional sized spanning empire who can affect higher realms, into an isolationist pocket dimension. The societal structure of the Aureliens were destroyed: Aureliens were now separated in caste structures and only the royal houses and Emperor could use the God Particles properly.