Any relation to Midgar? Or the Midgar Zolom?

Anyways, what the heck is this guy? Why did we fight him? Why is there Magitek Robots here?

What did he do to us? Are we no longer bound to Hydaelyn? He took the power of our crystals and what... Became a minion??

Da heck does all of this mean? Is he stronger than Hydaelyn? Is he a primal? Is Hydaelyn a primal?

Why does he hate Ishgard?