There called Fire Rods.
Sort of like a magical flame thrower. Cause it's magical, there's no fuel tank or fuel line to worry about.
Anyway, this would be the sort of thing I'd like to see included in the rules for forbidden weapons.
I have to admit that I haven't seen one of that design in the comic.
Theyr's just a Stave shaped weapons. One of those Rods of Egyptian design.
This one here, does sort of look like a Musket.