Xen

Xen is a fictional world that appears in the science fiction video game Half-Life (Valve Software, 1998); the expansion packs Half-Life: Opposing Force (Valve Software and Gearbox Software, 1999); Half-Life: Blue Shift (Valve/Gearbox, 2001); and Half-Life: Decay (Valve/Gearbox, 2001). Xen is sometimes referred to as the border world. Rather than being a planet or an...
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