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I don't recall that this has been discussed yet...

Did we ever find out, or were we ever told, what those little glowing will-o-wisp things were? Y'know, the ones that sometimes seemed to guide you... and were also in Nihilanth's chamber, if I remember correctly...

Ghosts? Bugs? Some kind of monitoring system used by the Xenians?

And will they be back in HL2?
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