Editing The Justicars (section)

==The Emissarium==

''"Keep your friends close, and your enemies closer."'' <br />
(Ancient [[Tiberia V|Tiberian]] Proverb)

roles:

:* Handling diplomacy and inter-legion communication
:* Coordinating operations with the 13th when required
:* Discreetly watching over other legions for any questionable behaviour
:* Establishing intelligence networks for foreseeable future operations
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Akin to the Crusader Host on Terra, the Emissarium was officially a non-combat role, with a single marine, or Emissarius, embedded into each of the other legions. 
The role was a temporary posting, and was held for about a two decades, before being rotated to another.
The rotation, and the Emissarius itself was designed to teach the brightest and best of the 13th the skills and philosophies of the other legions. The purpose of this being that they could be studied and adopted, or methods devised to counter them.
While officially a non-combat role, being attached to the retinue of a Primarch or Battle-group Commander meant Emissarius often saw a great deal of combat.

At the outset of the Heresy, Uriel had manipulated the rotation of the Emissarium to ensure that he had marines he could trust in the right positions; he assigned men he trusted to the legions Uriel had determined would side with Hektor, and the few loyalists the 13th had were assigned to the legions Uriel believed would remain loyal. This helped keep the 13ths loyalty undetermined for such a long time into the Heresy.
In this way the Emissarius was a vital source of information for the 13th, and helps explain how the Traitors in general were so successful prior to the Siege of Terra.