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Combine Citadel theory
lol combine arent xen there an extremely advanced civilization on an unknown planet but apparently they take over other worlds to make a bigger army. hydras were cut from half life 2. -
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Combine Citadel theory
no the resources are water, oil etc coz if u look on the coasts in hl2 theres moss which looks like where water used to be. people arent exactly resources lol :D