Arcane Cleaver

Make an attack roll with a weapon with which you are proficient in, using your spellcasting modifier in place of the usual ability score. If the attack hits, the target takes an additional 1d4 damage of the weapon’s type. This attack is considered magical, but can only be cast once per turn. The weapon's additional damage increases at 5th level (2d4), 11th level (3d4), and 17th level (4d4).