Okay.
Remember the sundering of the Jade Prison? Well, that was a byproduct of a deal between the Yozis and the Neverborn. The deal was simple: The Deathlords can have as many of the Solar Essences in the Jade prison as they want, so that their fancy Celestial Monstrances of Portion (designed by the Yozis and perfected by the Neverborn) can be put to good use----so long as the Yozis get fifty of the Solar Essences in exchange and nothing more. Well, as you know, **** went swimmingly: The Deathlords resurrected a behemoth that smashed the Jade Prison to pieces and managed to snag Solar Essences from it. Unfortunately for the Deathlords though, they inevitably got the shaft: They managed to nab about maybe a hundred or so of the Solar Essences, fifty of which went to the Yozis. The other hundred-odd Essences were scattered out into Creation.
Those fifty Solar Essences...? Oh, the Yozis had an awesome plan. Why not create our own Exalted, in mockery of those gods that felled us beforehand. Oh, yes. A rich plan. Thus empowered, these corrupted Solars can go out and re-create Hell on Earth (Creation) so that the Yozis can break free.
Ohhhhhh these guys are bad-***. If you want the book, I can send it to you. Edit: PDF file. Like through e-mail.