A talented warrior, Vuxio was a CoE member for a short time. He is extremely powerful.
Vuxio was originally a matoran from the realm of Karzahni. When the Toa Nuva arrived, they helped Vuxio escape. In return, he became a Toa of Nightmares. He was then unwittingly transported to Karda Nui. While he was there, He was mutated into a viciously equipped form. Giving in to rage, he let himself be turned into a shadow toa by a makuta known as Intor. He was transported by the Ignika to the realm of the Great Beings, where Cruvessius dwelled. He altered his heartstone so that it could be removed, but was covered with a thick shell. He has been aiding Cruvessius ever since. He carries a mutated katana, twin spikes, and twin chargers.