Barbed Blade

You imbue your with weapon with a magical energy, for the duration of the spell whenever you hit a creature it must make a Wisdom saving throw against your spell save dc or take an additional 1d4 physic damage in addition to the weapon damage and you weapon can overcome damage resistance of the weapons type as if it where magic.  

For every level over 1st level spell spot cast add 1d4 physic damage to a max of 5d4