Echoing Assault

After you hit a creature with a melee weapon, use a bonus action to cast this spell. 

Choose a different creature than the one you hit by the strike within range and summon a ghostly echo of yourself within 5 feet. Make a melee attack roll through the ghosts position using the weapon used before casting the spell. On a hit, you use force damage instead of the weapons damage type.

Using a higher level spell slot: Summon an additional echo to attack a different target for each spell slot level above 1.