Quov Tsin is a Vizjerei sorcerer who does not appear in-game in Diablo 1 or 2 but may make an appearance in D3.
In The Kingdom of Shadow, he wants to find the portal to Heaven through the fabled city of Ureh.
Aided by Kentril Dumon and his mercenaries, including Gorst, the Barbarian, he sets out to find the city.
Unknown to him the city, is watched over by Zayl, a Necromancer.