I believe that his placeholders are Gorakhul the Annihilator or Rakurjahl the Warbringer. He spawns at the table like they do and only one is up at a time. I camped the room for several hours and this is what I noticed. If anyone has any differing opinions, please let me know. I could find no other information on him anywhere else, and the locations in the room were different from where he spawned.
Cayden of Antonia Bayle