Theol Drost was a Human male Imperial Army officer serving the Galactic Empire during the Galactic Civil War. As a high colonel, Drost commanded the Army detachment committed to the assault on Picutorion, an engagement that was part of the Kwymar Suppressions, alongside his Imperial Navy counterpart, Commodore Bevven. During the battle, Drost deferred to the judgment of Imperial Security Bureau officer Mar Barezz in allowing two of his men, Captain Ganig and Sergeant Stecker, to be killed in action to prevent the possibility of two decorated heroes of the Empire defecting to the Alliance to Restore the Republic. Drost spent the next decade commanding various space installations until receiving a promotion to general and command of the security of the Bilbringi Shipyards.