Do we need? Yes, I think we do.
Levi was born of a different name. A name that is most similar to a high pitched screech. He was raised in the mad kingdom, and learned that he was different from the other Kithark. He enjoyed killing people. His back story changed, depending on the day. But the consistent elements are that he tried to kill the leader of a Crusader outpost in the mad kingdom, and killed the potato peeler instead. This lead to Crusaders going after Kithark, as they feel they all look the same. In the end, he was captured, and brought to the Mad King, who decreed his punishment was to guard Mother. This infuriated Alexander. After going through the portal to Mother, there was some confusion, something to do with psychic powers, but Levi the Assassin joined the part soon after.