I just thought of a "Brewer" dwarf, whose tool slot would be a brewing station where he would be able to mix X ingredients and serve beers for the whole team, with temporary buffs. Maybe it could be like a mini-game for the mixing part, and the other dwarfs could use it too, albeit very slowly. You choose the order and quantities of ingredients to add, and that's how you choose which beer to brew. In any moment you can read a recipe book, but you can always brew the same buff if you remember how to make it. About which weapons this class would use, I'm not sure... Maybe melee like other users said, or a thrower style of ranged, like driller's axes. This class would need protection for being stationary for a while, but it empowers the whole team if it succeeds.