There's a little light in every darkness

A pony is created from Nightmare Moon and King Sombra to bring in an era of chaos and destruction by overthrowing the princesses. However, things don't go as planned as the unknown pony kills those that made him in order to find his own purpose and belonging in the world. After only leaving behind a body count with every town he passes, his journey eventually leads him to the city of Canterlot where he bumps into a young mare which appears unlike many others. Will this new mare be able to help the pony find out his place in the world and give him much more? Or will his past actions push away all the good he gains and pull him into the darkness forever?