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'''Xenos''' is an [[Imperium|Imperial]] term synonymous with '''"alien" ''' (from the [[human]] perspective), and refers to all non-human and extraterrestrial sentient species.{{citethis}}

The major alien races are the [[Ork]]s, [[Eldar]], [[Dark Eldar]], [[Tyranid]]s, [[Necron]]s and the [[TauT'au]]. All these races pose a considerable threat to the survival and continued dominance of mankind. There are countless other races but all are trivial by comparison.{{citethis}}

Despite all the fear and hatred, on certain occasions, short-termed military alliances have been established with the '''[[Eldar''']]. These temporary alliances are somewhat uncommon but not unheard of. They are made against a common enemy like the forces of [[Chaos]], [[Tyranids]] or [[Orks]]. The [[Imperial Navy]], units of the [[Imperial Guard]], and even detachments of [[Space Marines ]] have, on certain occasions, fought beside Eldar forces. A fine example for this is the [[Gothic War]], during which the Imperium allied itself with the Eldar of the [[An-Iolus ]] [[Craftworld ]] against the forces of [[Ezekyle Abaddon|Abaddon the Despoiler]]. No temporary alliances with the [[TauT'au]] have been made, but short-termed term truces have happened.{{citethis}}

Certain individuals, like [[Space Marine Captain|Captain ]] [[Gabriel Angelos]] of the [[Blood Ravens]] have had friendlier contact with certain Eldar. The [[Blood Ravens ]] [[Chapter ]] in particular has had unclear contacts with the Eldar throughout its history. This is, for obvious reasons, kept secret by all parties involved. Ironically, the secrecy surrounding the Blood Ravens' actions with the Eldar could possibly be one contributing factor to the Chapter being largely unaware of its history.{{citethis}}

Unlawful friendlier contact on a larger scale can happen, as some [[Imperial Commander|Imperial governors ]] simply ignore Imperial law if the potential rewards are great enough and will trade with some xeno-races. Many items of xeno-origin are smuggled into and within the Imperium. Exotic weapons, tomes of knowledge, poisons, certain xeno-devices to dispose of one's rivals, etc., seem to be craved by certain members of the jaded elite and commonly used in some quarters. A known example is the '''[[Jokaero]] death spider''', which uses [[zarthax]], one of the deadliest poisons in the galaxy.{{Fn|1}}. Certain Imperial factions use xeno-weaponry on occasion.{{citethis}}

Some governors have even hired alien [[mercenaries ]] to maintain their grip on power.{{citethis}}

The '''[[TauT'au]]''' deliberately foster such developments, trading with nearby Imperial systems [[system]]s and preaching the ideals of the [[Greater Good]]. As a result, a very small number of Imperial governors on the frontiers of the [[Ultima Segmentum]] have recently seceded from the Imperium, pledging their allegiance and the loyalty of their respective worlds and star-systems to the Tau empire[[T'au Empire]].{{citethis}}

The relationship between particular alien races and [[Chaos]] varies from case to case. Some are by their nature completely immune, such as the Necrons. Others, such as the TauT'au, appear to be largely immune to Chaos corruption, although much of this immunity is of social nature. Others have been completely corrupted. Races influenced and corrupted by Chaos include the [[Bale Childer]],{{Fn|3}} [[Yu'vath]],{{Fn|3}} [[Saruthi]],{{Fn|4}}, [[Grell (Xenos Species)|Grell]]{{Fn|8}}, and [[Xenarch]].{{Fn|5}} ==Images==[[Image:Xenos6.jpg|thumb|center|500px|Various races of Xenos{{Fn|6}}]]

*Etymologically, "ξένος (xénos)" is a Greek word meaning "stranger" or "alien".

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