Before Creation was concieved, before the fledgeling Precursers rose to Godhood; there was only the fathomless deep and boundless darkness known as Tehom - or as we we know it - the Abyss. They sealed it away Eons ago, burying it and Them under layers upon layers of Creation. And yet, over the eons, despite countless Cosmic Resets, They still find their way into Creation, thanks to the Delusional, the Dumb, and the Desperate.
And the Dumb has called one to Canterlot City.