Dark Heresy: Semper Primus Cell
The Overlord is the embodiment of Hive Fleet Dagon’s ire.
The Dagon Overlord is in appearance similar to a Hive Tyrant, a creature of terrible and horrific majesty all on its own, but is different enough to stand apart from its lesser brethren and be remembered by those that see it looming across the battlefield. Covered in slimy plates of chitin which constantly drip and leak fluid, the Overlord projects an aura of horror and menace like nothing else within the swarm. Its importance and power are also readily apparent when it strides alongside other Tyranid creatures, its powerful presence emboldening and maddening the lesser creatures more so than would be expected by any link to the Hive Mind. It is almost as if the Overlord is the embodiment of Hive Fleet Dagon’s ire toward the Jericho Reach and its alien hatred infects creatures with a personal desire to murder, maim, and kill all those in their path. It has been suggested that this notion of the beast’s personal vendetta is just the fanciful imagining of terrified Imperial Guardsmen, though only by those who have not seen the Overlord beast in the flesh themselves.
Since its first appearance, the Dagon Overlord has been sighted in almost all of the major combat zones of the Orpheus Salient, leading swarm after swarm into the ranks of Imperial defenders. This has led many to believe that the Overlord is just one of many, and not a unique creature at all. However such notions of individuality are hard to determine when dealing with the Hive Mind, as it is constantly recycling its troops and adding to them by consuming worlds. This means the Overlord may well be a veteran of many wars, and may have even fallen countless times to the foe, only to be re-spawned by the Hive Mind with a fresh body and a will for vengeance. Both the Ordo Xenos and the Deathwatch have made attempts to find the truth behind the Overlord, if for no other reason than to catalogue a new and deadly variation of the Tyranid race. Neither has met with much success, and both agents and Battle-Brothers have been lost during the process. Even when the Dagon Overlord seems defeated, it invariably rises again in another place or another time.