The Blesser is a good starting weapon for sure, at level 5 it gets a combo weapon. I haven't seen any pure muscle after that, maybe the bandit boss drops one, but if you want an okay combo weapon for it, the blacksmith also sells a muscle and weight combo weapon, and the slime weapon has a scaling in strength as well. And there is the drill weapon from the foremen, if I recall. If anyone else finds one, let me know.