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A rank established for the [[Sons of Horus]] [[Traitor Legion]] by [[Warmaster]] [[Horus]] during the [[Horus Heresy]], they were merciless experienced warriors who were charged with ensuring their [[Primarch]]'s allies and servants remained unquestioningly loyal to him. Besides being his watchful eyes and ambassadors, the The Dark Emissaries also guided the Warmaster's forces with their strategic experience and served as a paragon of skill and martial prowess, that every member of the Sons of Horus should strive towards. However they would also serve as executioners for anyone that failed to live up to the their exacting Primarch's expectations or worse, displayed seditious intentions. These could be carried out by the Dark Emissaries' [[Staff of Dark Authority]], which was a symbol of their status.{{Fn|8}}

Members of the [[Librarius ]] who returned to their studies with or without the blessing of their Primarch and delved into forbidden lore that saw common use on the battlefield.{{Fn|1a}}

Masters of the machine and foundry, Forge Lords are the most experienced and skilful of the Legion’s Techmarines[[Techmarine]]s. These warrior-smiths are skilled battle-leaders as much as they are artisans of war, and are often appointed to the command of Legion detachments comprised largely of tanks and armoured vehicles or battle-automata, as well as serving as stewards to a Legion’s Dreadnoughts.{{Fn|7a}}

Within the ranks of the Legions at the time of the outbreak of the Horus Heresy there were few remaining [[Space Marine Scout|Scout]] cohorts, with most companies equipped with scout armour long since reassigned to [[Reconnaissance MarineSquad|Reconnaissance]] detachments. Those few that remain are often veterans of over a century of war in the most hostile terrain known to humanity, and the last Pathfinders are the unchallenged experts on combat in this field.{{Fn|7c}}

High officers of the Legion [[Apothecarion]], the primus medicae of a Legion hold the onerous duties of both ensuring ensures the battle-readiness and physical wellbeing of their battle-brothers. This is an authority which none but a Primarch or his chosen deputy can overrule, and such warriors are dedicated to preserving the gene-seed of the Legion from loss or contamination at any cost, even that of their lives.{{Fn|7a}}

These warriors were pioneers of early attempts by the Legiones Astartes to counter the Daemonic once the spawn of the [[Warp ]] began to appear in number during the Heresy. They sanctioned research into esoteric artefacts and weapons and openly sought prohibited lore in the hope that it would provide wisdom capable of combating the Daemonic.{{Fn|1b}}

These Centurions [[Centurion]]s were hardened commanders who were much respected for their willingness to heroically throw themselves and their men into the toughest resistance, and are entrusted to prosecute shock assaults which crush the foe in a single action.{{Fn|1a}}