Equestria has been discovered by extra-Equestrian life. Do these advanced newcomers come in peace, or do they have other goals as well?

After the defeat of Yami, Amaterasu and Waka headed for the Celestial Plain, planning on returning it to it's original condition. Upon arrival, they quickly realize that things have changed. First, the Plain is inhabited, but not by celestials. Second, the plain has grown, now an entire small world... full of ponies. There are many things to do in order to restore the Plain to it's heavenly status... if Ammy would just bother to stop sleeping!

An Okami crossover. Background knowledge not needed, but helps.

Festivals, fun? Of course! Dangerous? Only if they're good! The denizens of Tartarus have decided to use Equesria as their new hot-spot, bringing their people, ways, and dangers. The story follows the various events that occur around the elements, the royal sisters, and a few varied demons. There is so much to learn, if you can manage to stay alive long enough to share it. Maybe the girls will even learn a little bit about evil and its own sets of black and white...with a whole lot of gray.