The Theatre Key open The Puppet Master’s Theatre dungeon.
The Puppet Master’s Theatre is a medium to high-level dungeon that is a source of Potions of Attack, the Prism of Dancing Swords, the Harlequin Armor, and some dungeon-exclusive skins and cloths. The normal enemies in the dungeon are “puppet” versions of certain classes and mimic their abilities.
Entrances to the Puppet Master’s Theatre are uncommonly dropped from Leviathans.
This dungeon does not need to be completed to earn the ‘Tunnel Rat’ fame bonus.