Rerian was born in the slums of Noxus. His mother was married to a Hemomancer, supposedly one of a kind. He had left long before his birth, and traveled south to an unknown temple.
His mother died of disease a few years after his birth. Growing up alone is hard. Growing up alone in Noxus is near impossible, but Rerian managed by acting as a curier between crime syndicates.
Rerian saw everything, Death, Murder, Hate, Lust. And he hated it, but he hated his own involvement in it even more. He hated that he had to do this to survive.
One fateful day while running on a rooftop from some more angry customers, a sharp debilitating pain erupted in his gut mid jump. Failing to properly land on the next roof, he fell down the alley way, and was impaled on a sharp piece of wood twice the length of his body.
Rerian awoke to see himself covered in his own blood, slithering around him sealing his stomach and head wounds. It had even ate away at the wood inside of him.
Two years later, Rerian appeared at the doorsteps of the League of Legends. With powers only seen in another champion: Vladimir. He asked only one thing: To oppose Noxus in every match.