Minecraft Dungeons:Mason

"There's also a Mason who will give you Diamond Dust in exchange for Emeralds. Diamond Dust can be used to increase the Power Level of a piece of gear."

- Minecraft Dungeons Guide Book

The Mason is an unimplemented merchant that would upgrade the player's current gear using Diamond Dust. It is unknown where it would be found, though its most likely that it would have appeared in the player's camp after completing the Redstone Mines. Its item upgrading functionality has recently been took over by the Blacksmith, and the stall area it would have used is now used by the.