how about a Japanese drum hammer for decay instead of an axe?
3D design Hammer of decay (減衰) - Tinkercad here is the link for the drum hammer of decay, and I added the Japanese word for decay on the hammer, so when you edit the hammer, please keep the Japanese word for decay, and the eye on rox’s elemental weapon was suppose to represent the element personified.
Edited for Double Post - BioKnight