Empowered Weapon

Imbue a weapon with pure magical power, causing it to deal an additional 1d10 + spell casting modifier force damage. If you hit a creature with the weapon you imbued with power, you can make an additional weapon attack as a bonus action. This effect is given to the wielder of the imbued weapon and can be someone other than the caster. 

Casting this spell at a higher level allows you to touch 1 additional weapon per level upcast.