Central Hall is a location in Xenoblade Chronicles. It is accessed via the Prison Gate. It is a large room on the ground floor of Prison Island. This location differs at the middle of the story progression, during the midgame visits, and at the end of the game with several changes involving new transporters, enemies as well as Collectables.
Central Hall (Midgame)
Central Hall is accessed via the Prison Gate. There are no enemies and it contains nothing but a dark transporter near the entrance to the Great Canyon. There is a transporter at the end of the room, but it does not work at all.
Central Hall (Endgame)
Central Hall is accessed via the Prison Gate. It is found to be filled with Bargs and Nebulae, and the transporter at the far end is active, and can be used to reach the Banquet Hall. There are also two hidden rooms on the sides of the hall - one to the north and one to the south, underneath the large square blocks on the map - which each contain a Giant's Treasure Chest. They can only be entered when the Bone Pillar has been lowered.