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Round Table Room is described to be a gigantic table carved of gleaming black stone sat in the center of the room. The guild's insignia is embedded within the middle of the table. It is surrounded by forty-one luxurious chairs where each one was positioned around in a circular pattern.
The room is most likely a reference to the Arthurian Lore of the Knights of the Round Table.
In Mass for the Dead, after the ruination of the Throne Room, by the Crack and Chaos Beasts, Momonga held his court in the Round Table Room as a substitute. In addition, it served as a staging area for newly resurrected NPCs who were killed during the transfer to the New World.