This creature is the dark mirror to unified bond between Gavin and Nex. He is a rare being, the fusion of the only sentient Viper - a monster named Ith, who was the first of his kind - and the mightiest of warriors bonded through the darkest magic imaginable. He is cunning, dangerous, and an unbelievably lethal survivor.
Through use of an ancient, mystical artifact called the Eye of Souls, the Vipermyst became a Soul Collector, a lich of the highest order. He was eventually defeated by Gavin - the Dragonmyst - and incarcerated in the Temple of Orman