This is just the preview of Thunderking Raid Dungeon.
Video present only environment view, without extra decoration models that will be presented in the final Raid instance with bosses and mobs.
Keep in mind this is not final, this is datamined from PTR Patch 5.2 files, and may be change in the final live content Patch.
Still learning damn 3DS Max, hopefully I will be better next time. I hope you appreciate this much :/