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Category:Xen creatures - Half-Life Wiki
Xen - Half-Life Wiki
Xen - Combine OverWiki, the original Half-Life wiki and Portal wiki
Category:Xen creatures - Combine OverWiki, the original Half-Life …
Gargantua - Half-Life Wiki
Half-Life's Dark and Mysterious Lost Borderworld | Xen - YouTube
Characters in Half-Life: Xen Aliens - TV Tropes
Xen - Half-Life Guide - IGN
Half-Life/The Combine and Xen - StrategyWiki
Does anyone know why most of the Xen aliens are not in HL2?
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