06-03-2016, 10:27 AM
(This post was last modified: 06-03-2016, 11:39 AM by DM Surranó.)
The problem is not the adamantine head but the wooden shaft. It's not designed for breaking the surface of several feet thickness of rock. You may try it but calculate with the likelihood of the shaft breaking after every single blow, similar to a low-end mason hammer. A mace, on the other hand, is metal tip-to-toe, like a quality mason hammer.
Similarly, a battle axe cannot be used to cut trees because it's supposed to cut deep and not to cut wide.
EDIT: reviewed the weights and pictures (both historical and those in PHB). The morning star is lighter because it has a wooden shaft. Both the heavy and light maces have iron (or whatever metallic) shafts. So updated text above accordingly.
Similarly, a battle axe cannot be used to cut trees because it's supposed to cut deep and not to cut wide.
EDIT: reviewed the weights and pictures (both historical and those in PHB). The morning star is lighter because it has a wooden shaft. Both the heavy and light maces have iron (or whatever metallic) shafts. So updated text above accordingly.