Description: The mod XET is singleplayer and takes you on the roll of XET member Bill Freeman. XET is supposed to be the survey team mentioned late in the game and in parts of Blue-Shift. You will visit new parts of Black Mesa and old parts of it; you will, of course, also visit Xen. It will have new monsters, new weapons, and new maps. Story: Hmmmm... It wasn't always like this, humans building colonies on Xen, at first it was a lot different... It all started with the top secret government facility called Black Mesa. Those scientists then stumbled upon teleportation technology and sadly, discovered Xen. At first it all went well with the founding of the Xen Exploration Team, or XET as we know it as, but after awhile the team got a little overconfident and then started to gather specimens a little to close to the alien borders. They say that during the invasion of Earth, all of the XET members were killed in the chaos. I, Bill Freeman, former XET member and colonist of Xen was...
When humans get headcrabbed they turn into Mawmen,
the Mawmen eventually turn into Gonomes. Gonomes
are the final stage of mutation caused by the
headcrab. They are much more powerful than the
Mawmen and faster. They throw lobs of what seems
to be the remains of the origonal host at their
enemies and will either slash you or try to push
you into their large mouth at close range.