of extraterrestrial origin, whether they be from Xen , or associated with either The Combine or Race X , which have been spawned by the science fiction FPS computer game franchise. Headcrab Antlion Vortigaunt Barnacle Houndeye Ichthyosaur “ http://half-life.wikia.com/wiki/Nihilanth Nihilanth Bullsquid Pages in category "Half-Life Creatures" The following 10 pages are in