Dark Jedi Knight

From Emperor's Hammer Encyclopaedia Imperia

Dark Jedi Knight (DJK) is the seventh overall rank and the first of the equites ranks. It's preceded by Jedi Hunter (JH) and succeeded by either Krath Priest, Obelisk Warrior, or Sith Warrior. Whichever they obtain depends on their Dark Jedi Orders.

Dark Jedi Knight is the appointment rank for the Dux position and it most commonly associated with them.