Mage - Rise of Atlantis
Most prominent member is Belethor, which is actually the only known member of the Light and certainly no one which is taken lightly. Although his face is known, his presence is shrouded, and if one ever encounters him, you can be damn sure this is no coincidence. He is a Seer, of course, but he is not known for killing other mage (most likely, this job is already taken by someone else or he is very good concealing his efforts). His nimbus is that of a dark tall man without a face just standing next to him.