Ummm... not to be terribly combative... but have you played the game? Exo are sentient machines, no strings on these guys, invisible or otherwise.
https://www.youtube.com/watch?v=hBje3YzbL1c
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Lol yeah I know. I was throwing some jokes. My primary character was an exo. They are bad ass.
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Sorry. Joking never comes across well in type. If I were good with photoshop, I'd take that video and put my Exo in his place. :)