When Eragon traveled to the east side of Alagaesia he expected to find a barren land, devoid of civilization. He never could have been more wrong. Now secrets of the past shall be revealed, old enemies shall return once again, and new heroes shall rise.

Rainbow Dash and Scootaloo are trapped in a place where your fears and horrors come true, The Rainbow Factory. It is a place that comes as close to a Hell on Earth as anything. Now they must escape with a little help from an unexpected source. (My own Alternate ending to the Rainbow Factory. If you don't like, don't read! Cover art isn't mine. Rated teen for blood, cursing and ponies getting crushed into rainbows.)

The Princesses have kept a secret from the Elements, a secret that dates back to when they were born. Their parents aren’t who they say they are. They aren’t even from this world. Now the 6 must travel back to their parent’s world and train for a new adventure.
Percy Jackson/mlp crossover