The standard term is mace, but Vannaka prefers bludgeon. "It's one of those sound words, like stomp and grunt, right? When I hit someone with it, it bludges. Bludge, bludge, bludge."
"You're thinking of onomatopoeia," Dionysius said, helpfully.
"Nah, but good try. I'm thinking of breakfast," said Vannaka.