Forgotten Map

The Forgotten Map is a unique, power skill which can only be used once per run. It grants a small percentage of passive damage reduction.

Location
When the Specialist's Showroom upgrade is unlocked, the Forgotten Map can be found in a cell next to the Hunter's Grenade. The player can unlock it for 4000 Gold or destroy the gate for a 50-kill Curse.

Trivia

 * When used, the game will say "You have been initiated into the secrets of the Architects".
 * The Forgotten Map, Blueprint Extractor and Hunter's Grenade are the only single-use skills in the entire game.