Any wizard with knowledge engineering/chemistry, profession Alchemy, craft arms and armor. Spend almost all of your spare time studying repeating mechanisms, make a repeating double barrel crossbow, upgrade it to have magazine's made of bags of holding. Research contact explosives and make explosive bolts, then for s$%&s and giggles add an under barrel launcher for various ordinances and enchant it so that it either makes the bolt larger in size or produces multiple bolts per shot. Add animate and permancy for a machine gun effect.
