I traveled to a village in my area of control in search of a Matoran brave/desperate/stupid enough to volunteer. I was fortunate enough to run across a villager named Vican, eager to find a more adventurous life for himself. What he got for the loss of his light instead was a life of shadow and the honour of being my assistant... a more than fair trade, in my estimation.
He was paired up with Mutran after Mutran had tested his Shadow Leeches on Vican. He was intended to be a lab assistant to Mutran, and Mutran eventually took him to Karda Nui with him where he continued his work in the Shadow Leech Hives, until ToaIgnika destroyed the sentient stone cord holding up the structure, sending it hurtling into the Swamp of Secrets.
Vican was later attacked and cured by a Klakk and became the first Matoran to be affected by the Shadow Leeches and the first to be cured. A Le-Matoran again, Vican encountered Takanuva and attempted to convince him he had found a cure for the Shadow Matoran. After this was proven true, and all Shadow Matoran were cured, Vican left with the Av-Matoran to Metru Nui where the Toa would meet them after the completion of their mission in the core. Sometime later he evacuated Metru Nui along with the other Matoran onto Spherus Magna.