Pyramidions are the "engines" the Vex use to transform planets into Vex machines.
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Those are Nexus. We don't know what the pyramidions do.
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I said they're that because that's what asher mir states in-game. He's an idiot though so who knows I guess
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Ahh well no you are probably right then. No telling if it was changed between games. That's why Luke smith say D1 was basically comic number zero, just a proof of concept basically. No telling what is or will be changed during D2 since they are still revising.