Can you reflavor a staff as a greatclub? Sure! A sai instead of a dagger? Of course! Could you pay a blacksmith to make your 3d4 Greatmaul deal 2d6 or 1d12 damage instead? Since the dice all add up to 12, it won’t break the game; ask your GM! Can a blacksmith make your Dagger deal that much damage? No, sorry!
Customizing Weapons
Core Rules v2 p. 34
Related Rules
4Armor & DefenseCharacters & Equipment / Equipment & Currency
Custom Weapon DiceCharacters & Equipment / Weapons
Equipment ProficiencyCharacters & Equipment / Equipment & Currency
Weapon PropertiesCharacters & Equipment / Weapons