Missing Models

I have a rather odd problem, The boss models for Patch 2.3 seem to be missing for me. I saw lord Ramuh Staff waving around in the cut scene where I meet him but not the primal himself. Similarly I can not see the Bosses of Syrcus Tower with the exception of the final one. I have heard of no one else having this problem so I am quite puzzled. I also noted that I would have a lag spike in Syrcus Tower right after a battle would end. Rather strange. If anyone has any suggestions on how to fix these problems I would be very thankful.

Greetings, friend!
Based on the information your have provided this appears to be a possible in game error, and maybe better addressed by filling out a bug report in the bug report section of our forums.
I hope this information has been of some assistance to you.

Best wishes, Taslorrum.