Alien Species Wiki

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Xen (pronounced 'zen', also known as The Borderworld, is a dimension discovered by the scientific research corporation Black Mesa, the final retreat of Nihilanth and the Vortigaunt race, and a place where most the alien species appearing in the Half-Life series migrated to before coming to Earth.

Rather than being a planet or an artificial structure such as a space station, all of the locations of Xen visited by the player during the course of the Half-Life series are on the surfaces of (or within) asteroids ("islands") floating within what appears to be a nebular...Read More