Brutal Warriors of Blood

After decades of being among ponies, Genghis Khan grew fond of them, and became a leader of pony armies. He became well known for his fighting skills and was the warrior of choice for bloody, evil conflicts against bad guys.

Celestia congratulated him personally on Canterlot Castle, giving him a medal of great honor for his service, before Khan undied and came back to Mongolia.

After his undeath, he lead his troops triumphantly against the English, savaging them greatly before he died again and was sent back to Equestria.

All things come to an end, as they say. He came back to Equestria and led the armies once again against Discord and Queen Chrysalis and Nightmare Moon and King Sombra and the evil Twilight Sparkle alicorn (Who is a very bad move, no alicorns, she should be a unicorn).

Khan's awesome victory paved the way for his undying and coming back to Earth again, this time pretending to be a German guy and killing a lot of people. Then he died again and came back to Equestria.

The ponies were mad at him for killing people, so they killed him and he died and ended up in Hell, where all bad people go.

In Hell, he was tortured for eternity for being a very bad pony, along with everyone who sinned in the eyes of the Lord.

The End.