Mystic-Tribe

The Mystic-Tribe (Orc."Vogau-Hai") were one of several orcish tribal confederations in which the Orcs of Mordor had split after the Fall of Barad-dur in the War of the last Alliance.The Vogau-Hai were the most religious of the mordor orcs and fanatic adherents of the dark worship.Most likely descendants of the orcish Dushi, they also delighted in dark magic and were quite cunning sorcerers,Conjurers and witches. After Saurons return during the years of TA 1980-2002 the remaining Mystic Orcs were reorganised and redistributed into newly founded Tribal coalitions where their masters used them to satisfy the orcs need for religious guidance and magic traditions.

References:

 * Middle-earth: Shadow of war