A group of Liches with Some Demonic Help

You were made from numerous souls, concocted together by a team of liches. They wanted to create something that would bring them straight to the top, but they were killed by a group of Paladins before they could ever see you awaken.

As for where they got the souls from, one of them made a deal with a demon lord to get access to some of the souls they stole in order to make you. The demon lord provided many souls, some powerful, some not. Though you aren't at full strength yet, therefore you need to keep a low profile until you have enough knowledge and power to do what the others couldn't do. Survive, win, and assert your place at the top.