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The Ordo Xenos was set up by the [[Emperor]] shortly before the [[Great Crusade]]. The word '''xenos''' means ''alien''.

They were created to investigate , and study alien racescatalog Xenos species, and destroy any deemed to be classified as a threat to humanitythe [[Imperium]]. This jurisdiction has been expanded to any members of the [[Imperium]] that deal with aliensxenos, trade (or deal) in their technology, or seek to hide or protect hostile alien species from Imperial forces. [[Inquisitor]]s of the Ordo Xenos are devoted to their cause(fanatically so, in many cases), and are is among the greatest forces force that can be arrayed wielded against an alien any given xenos species.

Armed with the best human and alien xenos technology availableknown, extremely knowledgeable about their foe, unflinching in their mission, the Ordo Xenos can respond to any alien possible xeno threat. Their tactics vary depending heavily on the situation , species of xenos involved, and level of alien xenos influence revealedon the local population. Where the threat is subtle they will use guile and stealth, wielding their power as if a scalpel used to cut out a cancercancerous growth. When the alien menace is great, the Inquisitor can enlist the aid of entire regiments of [[Imperial Guard]] and [[Space Marines]]. When the threat is too great for even these to handle, the Inquisitor will call on the elite battle-brothers of the [[Deathwatch]]. In extreme cases, entire planets are known to be destroyed through [[Exterminatus]].

The Deathwatch, the [[Chamber Militant]] of the Ordo Xenos, are a unique force of Space Marines composed of individual warriors from many different Chapters.They are specially trained by the Ordo Xenos to counter any, and all known xenos species. From ancient times there stood an oath between the [[Adeptus Astartes]], and the Ordo Xenos that the Space Marines would provide the necessary soldiers to them. They are required to serve a full term with the Ordo Xenos before being returned to their [[Chapters]]. They can be set apart due to the fact that all but their right shoulder pads are painted black (the shoulder pad retains their chapter symbol, so as to not anger the spirit of the armor).  They operate in [[Tactical Squad]]s, called Kill-Teams. Each Kill-Team consists of soldiers from all different chapters. However, it is not uncommon for rivalry to re-ignite among chapter members. The Kill-Squads are heavily armed, and capable of operating independently in a hostile, xenos environment. If the situation calls for it, they have been known to use xenos technology against their current enemy as a means for an ends. They are lead into battle either by a [[Brother-Captain]], a [[Librarian]] or in some cases, even [[Inquisitor]]s. Being incredibly fluid in their abilities, they can operate in an environment and are known to even infiltrate [[Tyranid]] Hive Ships. ¹