Quote Originally Posted by ElHeggunte View Post
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I don't know why they settled on the term "Turn". It could be referencing the spiral shape of an actual coil (you make one full "turn" as you go up or down each "floor"), though I don't think we've ever been made privy to the actual shape of the entire facility in any of the Binding Coils. It could just be SE's habit of giving things weird names.

Edit: Ah yes, just like this.
I'm trying to figure out where exactly did they mention it, but the reason why they got Bahamut trapped in the first place was to use him for a power source or something and the place sorta worked as a transformer as an unlimited supply of power for the Allagans (or something crazy like that). It would explain why some mobs in there have a move known as High Voltage.