A threat has been made against Equestria. The Griffin Empire's military extended in both size and magical ability. They have conquered Dragonstone, home land of all dragons and turned the mighty dragons in to their slaves. The end of Equestria is getting closer than ever before, an army of Dragon Riders, thousand and thousand of knights with unbreakable armor, spear can launch dark magic, capable of penetrate through steel, burn flesh in to ash, an army that can not be stopped…… well, almost can not be stopped, because the Guardian is here to save the day.

(Crossover with Destiny, How to train your dragon and heroes of Olympus; Humanized Ponies)