This resonance cascade caught the attention of the Combine empire, who, after the detainment of Gordon Freeman and the destruction of the Black Mesa Research Facility began to send their own legions to Earth. Scientists began investigating Xen and experimenting on the creatures found there by traveling through portals to reach it.Įxperiments into mysterious crystals found on the border world led to a catastrophic event, dubbed the Black Mesa Incident, which tore open the gateways between the dimensions and allowed waves of aliens to spontaneously travel through and begin attacking the unprepared scientists in Black Mesa. Shortly after the development of teleportation technology at Black Mesa, the Xen borderworld was discovered.
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