In his search for a heir he used one of his treasures a mirror which lead into another dimension. In this dimension there are no Ponies but bipedal beings called humans. They have great potential for hatred and malevolence, in the time as he watched them there where so many wars and bloodsheds. One night in this dimension he took an infant a girl with him home. The child didn’t changed the form like him it stayed as a human. He would raise this girl shape her, teach her make her his heir and he name her Isis Calcite.

Art is from ZantyARZ

I just wanted to have fun cosplaying as Deadpool, but now I'm stuck with two voices in my head. Oh, and I'm in Equestria.
It all started on Japan-day in Germany, when my life turned upside down. Now I'm stuck in Equestria with voices in my head that make me do stupid stuff, and all I want to do is go back home. The ponies think I'm evil and turned me into stone. For that, I'll show them what Deadpool can do.

Once upon a time, shortly after Discord’s petrification, he perfected his last creation: free roaming Humans. The humans were feared by all pony kind because Discord had made them into the perfect predators. However, the Humans were given the gift of free will (nothing is more chaotic as a free will), and did not like to hunt ponies. A human village was developed on the outskirts of the Everfree forest, where Ponyville is now located. In this village lived the greatest hunter the world had ever known. However, while on a hunting expedition, a tragedy took place, and in order to survive, the hunter makes a deal with Tirek, swearing to serve him.

(Not an Assasins creed crossover only the look of the protagonist)

A pony went through the worst, some think he is a monster but he is just a a lost soul trying to get his revenge. And another old mare's tale come true.

Art from Evil-Rick