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The Black Key is a key found in the Black Area of the Dungeon in the game Ib and is the very last type of key discovered on Ib's adventure through the Fabricated World. The Black Key will open the True Guertena Exhibit after Ib has escaped the cursed gallery (in either the endings Forgotten Portrait, Together, Forever, Memory's Crannies, or Promise of Reunion). The player must continue on the same file after getting an ending so the Black Key will let Ib into the True Exhibit.
After Ib and Garry (should he be with her) get into the Atelier of the Dungeon, they must ignore the Final Stage sculpture and take the key from a chest in the north end. The chest will disappear and allow them back into the main gallery, so they may escape to the real world.