[Displacement story.]

Viriola and Xel are siblings that got sent to an Equestria that has a few problems. The creatures of Grimm are running amok with the power of the Fade coursing through them. There are demons tempting and controlling the nobles of Canterlot and gaining more power over time. And finally, Princess Luna has been corrupted and is now part Archdemon, aka a big demon dragon that wants to kill everything. The only thing that can cure her is the Elements of Harmony, which are now lost to the winds from the last time they tried that.

The only chance this world has to survive is the siblings, one is an elf with lyrium coursing through her veins, and the other is a mage with more magic power to nuke a few towns. Their job is to find the Elements, cure Princess Luna, and maybe get to punch some nobles and eat some stinky cheese.

Yup, piece of cake.