Dungeon Chest Key

The Dungeon Chest Key is a Dungeon item that is found from secrets.

Obtaining
Dungeon chest keys can be found from secrets on Floor 4 of The Catacombs and above. They can only be found in chests, and it is currently unknown whether they can be found from bats in dungeons.

Usage
Dungeon chest keys allow the player to open a second dungeon post-boss chest after a dungeons run. When the player holds a dungeon chest key in their inventory, they can view the contents and the GUI of other dungeon chests when right-clicking on them. The chest is not opened until the open button within the GUI menu is clicked. Only one dungeon chest key may be used per run.

Trivia

 * For a short time after Floor 4's release, the Dungeon Chest Key was able to be reforged like a normal accessory which gave a stat bonus, however this was unintentional and it was patched shortly after. The item's reforge is not removable, as the feature was removed, though the accessory reforge is affected by dungeon scaling, giving it a bigger stat boots inside Dungeons.
 * The reforged Dungeon Chest Key is extraordinarily rare, with only 5 known items belonging to members of the community, however there are possibly more whose ownership is still shrouded in obscurity.