Thanks for the quick responses everyone!

Does anyone feel like that its Gilgamesh?
The multiple arms have me thinking that it's him.
Maybe the Garleans are keeping him contained until the right time?

Gilgamesh FFXIV Concept Art

Also thought the robotic arm was a nod to the cranes that attack you after leaving Vector in VI.

VI - Cranes

/offtopic
Just wanted to say thanks to all the loremongers. Been a lurker in this section of the forums for a couple months. Appreciated much of the information that gets passed through here. Makes me remember why I love FF so much.