Hall of Doom Holographic Tokens (Investigations)

Hall of Doom Holographic Tokens is a collection of Investigations that can be found in the Hall of Doom, and is only available to Villains. There are 4 parts that comprise this set.

Synopsis
''Intergang and it's cultists believe the Crime Bible prophesizes their conquest of the world through Gotham. Learning more about it's heretical tenets could help cripple their takeover attempts.''

Mail Messages
Upon completion of this collection players receive a message from the Riddler, accessible from any Mail TerminalVillains:

Item
This collection rewards the player with the item.