The Tower in the Sky
Azazel is an extremely powerful demon. He has many worshippers, including the Mind Flayers and a group of orcs. Legend has it that he imprisoned Zahiel in a tower, floating on a small island somewhere, guarded by the orcish tribe devoted to him. According to the legend, Azazel was banished by Larathien, along with Serin and Calik shortly after he imprisoned Zahiel; none of them have been seen since.