An off-hand mace created from kalphite body parts.
The off-hand drygore mace is a level 90 degradable melee weapon.
Drygore weapons degrade with use and can be repaired with chitin scraps which can be gained from breaking down damaged chitin - dropped by all exiled kalphites - on an anvil. One chitin will break down into 20-40 scraps depending on your Smithing level. You need 60 to break down the chitin.