Here’s the only “official” artwork we have: https://teespring.com/RP_Dino?tsmac=store&tsmic=rollplay#pid=568&cid=102304&sid=front It’s effectively a mace.
However, Rollplay doesn’t necessarily have an absolute unified vision on the aesthetic considering how the players involved imagine things differently, which is okay from a creative perspective. A lot of people envision it as something European in form with Asian influences due to the literal D&D classification (I believe the portrait they used to use for his character token had that design), I remember it once being described as something of a large mace (which seems to have inspired the poster art), and above Adam says he thinks of it like fantastical testubo.
