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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. "Xeno" is properly only used as a prefix. A xeno-artifact artefact or xeno-technology for instance respectively refers to an alien artifact artefact or alien technology.

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

The [[Imperium]] considers humanity the rightful rulers of the whole [[galaxy]]. Part of [[Imperial Creed]] is that all aliens judged to pose a threat to mankind's survival must be contained or destroyed. Aliens - along with mutants, heretics and deviants - are all considered enemies of mankind - for they threaten the very survival of the human race.

Many new alien races and civilizations civilisations are discovered by Imperial [[Explorator]]s every year. For the most part these aliens are ignored, contained, or if they present a threat to mankind or the Imperium, eradicated. Throughout its history the Imperium has fought many long wars with dangerous alien species. In most cases the Imperium has eventually won, but in some, the threat has only been managed to be contained.⁴

Some human organizationsorganisations, including some factions of the [[Inquisition]], individual [[Navigator]] families, the [[Illuminati]] brotherhood, etc., even have certain secret dealings and alliances with the Eldar. All these agreements are always carefully guarded secrets, as they would be considered treason by other more conservative factions of the Imperium. One such pact is the [[Coven of Isha]].

Unlawful friendlier contact on a larger scale can happen, as some 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 galaxy¹. Certain Imperial factions use xeno-weaponry on occasion.