Nate dog, it's only seemingly prehistoric. Coupled with the merely presumably superstitious natives, I think that there is hinting at some kind of twist. Not that there couldn't be an older force at work, I agree.
As for the Octigi, their inclusion in the game remains to be seen. It could be the castle-like mountain complex is the huge and menacing main facility. It doubt it would be McGee's mines, as most of those would be underground, obviously. "OMG! Look at the size of that entrance!"
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