Mechanist mace divers were a special division of Mechanists trained for working in aquatic areas, and were outfitted with special wetsuits. These divers were sent to work in Mechanist undersea operations, such as the Mechanist base below Markham's Isle.
Mace divers behave the same as regular Mechanist Mace Guards, deal the same amount of damage, and have the same number of hit points. They are aggressive and fast and will strike quickly and repeatedly when given the chance. It is best to avoid them, as two or three mace divers in a group can be deadly.