Baelin's Arcane Stike

The melee weapon you are holding is surrounded with arcane power. For the duration, you may use your spellcasting ability instead of Strength when making attack and damage rolls  using that weapon, and the weapon's damage die becomes a d8. The weapon also becomes magical, if it isn't already, for the purposes of overcoming resistances. The spell ends if you cast it again or if you let go of the weapon.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).