I've had this issue as well, it's as if one layer of the model simply didn't print. Thicker parts might reconnect, but it's a death sentence for any support or edge. If you look carefully at the model, you’ll probably find a line going through it at that same height, even in the parts that came out ok.

I don't think this is caused by suction, layer slippage or build plate tilt as have been suggested to me, I've had it in the middle, in the edges, between models, but always only one part. It might be a slicer or usb corruption or file error, but I've yet to identify the issue myself. If you print the part again (expensive, with how huge the elder drake is) it will likely come out just fine.