The Xenos are a human-only faction with a rabid hatred of all other races. They are dedicated to enslaving or eradicating all non-humans. They often use subterfuge rather than direct warfare (for example, pitting two non-human factions against each other). The Xenos destroy artifacts they come across and rewrite history to serve their own purposes.
In the singular, a member of the faction is known as a Xeno.