Wizards enter the Main Hall during the quest Changing of the Guard, and the instance quest The Dog with the Twisted Lip, to track down Doctor Jackall. This is the second instance in Barkingham Palace.
There is one area that is found within this instance:
Connects ToBarkingham Palace
Creatures and Tower DescriptionLevel 1: Corrupted Grenadier, Corrupted Grenadier
Level 2: Chief Whip, Bulldog Sergeant Major
The Main Hall Wooden Key Room is located here.
Level 3: Noxious Gas Golem, Chief Whip
The Noxious Gas Golem will periodically summon Gas Elementals into the duel.