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so that mean the creatures of nihilant are not from xen?(and it will be just the big head floaters or all the creatures)laidlaw
We knew that some immense threat had chased the Nihilanth and its creatures out of their own world and into Xen, from which location they were all too glad to seize the opportunity to continue on to Earth with suppression through the citadels. But the exact nature of the threat was left to be solved in Half-Life 2.