The Palace Guard, was the counterpart to the Theron Guard. The Palace Guard was made up of the most decorated accomplished Drones in the Horde’s army. They were charged in the defenses of the Palace and the Queen.
The Palace Guard were first seen during Operation: Hollow Storm, when Delta-One were able to breach the defenses of Nexus. Setting up an ambush in front of the palaces gate, the Palace Guards were able to pin down the Gears before being defeated by Marcus Fenix and the gears under his command. Delta then was able to breach the inner sections of the palace and killed every single Palace Guard they encountered, who all gave their lives in the name of their queen.
After the flooding of the Hollow, the surviving Palace Guards became the bulk of the Queen's Guard, a loyalist army under the direct command of Queen Myrrah, while many of their Theron brothers became part of the Savage Locust.