The Copper Labyrinth is a 'harvestable' that was introduced during the Ratboy's Nightmare Update. It is one of the many collectibles that are needed by the players in order to complete the entries of the Itempedia of the Nightmare.
In appearance, the Copper Labyrinth looks very similar to the Liquid Maze, however, the collectible is now properly positioned to stand fully upward with what appears to be copper, antenna-like horns growing out of its head.
The Copper Labyrinth does not have any usages in-game that will benefit the players, other than to be sold to a selling vendor at a selling price of 42,000 gold, or an itempedia entry.
- The Copper Labyrinth can be seen as a more detailed and corrupted version of the collectible, the Liquid Maze.