Xen, Half-Life Wiki

Xen (pronounced "zen" ) is the Borderworld, a plane of existence connecting two or more dimensions (which Xen can be referred to as). It was discovered by Black Mesa research scientists, who regularly traveled there via teleportation to collect samples and study the myriad species of flora and fauna within, despite the extremely high risk of doing so. It is also the final retreat of Nihilanth's race and the place where most of the alien species appearing in the Half-Life series migrated to after

Snapbug - Combine OverWiki, the original Half-Life wiki and Portal wiki

Xen, Half-Life Wiki

Black Mesa Research Facility - Wikipedia

Locations of Half-Life - Wikipedia

Sweet Half-Life - Combine OverWiki, the original Half-Life wiki and Portal wiki

Nihilanth, Half-Life Wiki

Half Life Walkthrough Guide, Gameplay, Wiki - News

Xen, Wiki

Charger (Xen creature), Half-Life Wiki

Chumtoad - Combine OverWiki, the original Half-Life wiki and Portal wiki

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Xen (Location) - Giant Bomb

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Xen, Half-Life Wiki