Dragon Star, Goblin Moon
The old wizard Obanar was once bound to GABBE as the leader of The Blue Cloaks. Obanar blames himself for leading the rest of his company into a trap within The Tomb of Horrors from which only he escaped.
In the years following the loss of his companions, Obanar has exiled himself to the city of Argent, keeping a lonely vigil over The Planes of Chaos, watching for incursions into the world from The Elemental Chaos. Years later he returned to the tomb to rescue his fellow Blue Cloaks but failed and was imprisoned with them.