Xen
Xen is the fifteenth chapter of 
Half-Life.
It is an alternate dimension discovered by Black Mesa scientists prior to the original Half-Life. Black Mesa sent expedition teams into Xen to collect alien samples, and is the source of the crystal that triggers the resonance cascade early on in the game.
Contents
Architecture
Xen consists mostly of organic, spongelike platforms floating in a nebulous void. Various energy spires and other organic growths are commonplace. Xen occasionally features larger cave systems underground. The gravity on Xen is lower than on Earth.
Xen was often criticized for its frustrating "jumping puzzles". Therefore, it is best to relegate moving platforms to an atmospheric role rather than a gameplay mechanic.
Environment
Xen's lighting consists mainly of glowing crystals and bio-luminescent tubes. Odd fungi and pillars and can be seen spread around in areas.
NPCs
No humans should ever be seen in a Xen level. Occasional dead expedition members can create a disturbing and desolate atmosphere, however.
Aliens should include headcrab, the barnacle, and the vortigaunt.
Maps
The following .bsps comprise this chapter.
c4a1
Gallery
Xen teleporter
Xen has a strange purple fog in some areas
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Hazard Courset0a0 |
Black Mesa Inboundc0a0 |
Anomalous Materialsc1a0 |
Unforeseen Consequencesc1a1 |
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Office Complexc1a2 |
"We've Got Hostiles!"c1a3 |
Blast Pitc1a4 |
Power Upc2a1 |
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On a Railc2a2 |
Apprehensionc2a3 |
Residue Processingc2a4 |
Questionable Ethicsc2a4d |
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Surface Tensionc2a5 |
"Forget About Freeman!"c3a1 |
Lambda Corec3a2 |
Xenc4a1 |
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Gonarch's Lairc4a2 |
Interloperc4a1a |
Nihilanthc4a3 |
Endgamec5a1 |
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