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

Black Mesa Incident - Combine OverWiki, the original Half-Life wiki and Portal wiki

Alien Controller, Half-Life Wiki

Xen, Half-Life Wiki

Who is that? (Opposing force) : r/HalfLife

Half-Life (series) - Wikipedia

Half-Life - Wikiquote

Category:Xen creatures, Half-Life Wiki

Xen Cryo - Compo 15 - TWHL: Half-Life and Source Mapping Tutorials and Resources

Improved Xen at Black Mesa Nexus - Mods and community

Half-Life: Xen Aliens / Characters - TV Tropes

Xen - Sven Co-op Map Database

Xen Fungus, Half-Life Wiki

Xen (Half-Life universe), Hypothetical Planets Wiki

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