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'''Xenos worlds''' are non-human and non-Imperial worlds inhabited by alien races. Most alien races occupy only a single world or a small group of worlds. The majority of aliens are comparatively primitive, peaceful or powerless, and of little interest to humanity. Only a few alien races are powerful, aggressive and possess technology which rivals that of the Imperium. Of these, the most common are the [[Ork]]s, [[Eldar]], [[necrons]]s, [[Tyranid]]s and [[Tau]].¹