There was a vast sea of Nothingness. No existence at all, no consciousness. Then a spark. A single mind of consciousness, self-created One. It drifted through the fast sea of Nothing, searching for something, anything. Finally in despair and loneliness, it decided to divide itself, and the One became Two. One male and one female, soulmates. No longer alone, but with no other stimulation, they created a Universe, bodies, food, sex, etc. Eventually they created others, two pair of soul mates…these six are the Old Ones.
The Old Ones decided to create their Opposites, because they were always seeking new interactions and experiences. Diversity is beautiful, or so they thought. These six are the Elder gods or Elder things.
Eventually the Old Ones began to see disturbing behavior in their creations. They became delusional, believing that there was some omniscient ethereal god that was controlling everything. They began to split themselves apart in an attempt at what they called “purification.” It was madness. The Old Ones knew they would have to do something before the Elder Things became a problem. Unfortunately they were too late. In one great move, the Elder Things and their pieces struck. The blow threw the Old Ones, and the Elder Things out of the Universe, creating other dimensions. The Old Ones were split into six pieces across six dimensions. The Elder Things were also split into six dimensions. All outside of the Universe.
The last dimension of Order, belonging to the Elder Things, is what they considered to be their god. It was a machine, a machine they had programmed to create. So create it did. Over and over, until the fabric of existence was spread so thin, it threatened to wipe out all of existence. Still the Elder Things fought with the Old Ones, trying to hold on to their beliefs.
The Old Ones had no choice but to step in or be obliterated. They broke into their Universe to take it back, and obliterate all that stood against them.