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"Until recently, many players speculated that the Combine may have possibly controlled Xen, based on the similarities to some practices and technologies used by the Nihilanth. However, Valve's marketing director Doug Lombardi has stated that the Combine had, in fact, invaded a different homeworld from which Nihilanth's race was forced to escape. The defeated Nihilanth sought refuge in Xen, where the Combine could not (or would not) follow."


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