"The Hall of Doom is the seat of power for the world's most powerful leaders and entrepreneurs. Its inner workings are highly developed and complex. It could be profitable to hold onto any items you may find here."
|1:||"Pit Fighter" Combat Bracer|
|2:||C & C Comms Keycode|
|3:||Biosphere Gene Scanner|
|4:||Inner Sanctum Access Pass|
|5:||Weapons Lab Protection Field|
|6:||Dungeon Biometric Wristband|
|7:||Armory Ultra - Security Key|
|8:||Teleportation Tubes Beacon|
Mail Messages Edit
|From: The Riddler||Subject: Insider Trading|
|"The information extracted from this assortment of items you've collected from the Hall of Doom will likely fetch a king's ransom. However, the more intriguing secrets they revealed are priceless."|
|Attachment: Prince Ulgo's Massive Helm|
This collection rewards the player with the Prince Ulgo's Massive Helm item.