Widowgast's Shield Bash

You throw your pact weapon at a target within 50 ft. The target must make a DC 15 DEX Saving Throw. On a Success, the target takes half damage and the pact weapon returns to you without hitting additional targets. On a failure the target takes 1d6 Force damage. Choose one target within 20 ft., the weapon flies towards that target who must also make the DEX Saving Throw or take damage as well, continuing on to an additional target within 20 ft.  This effect also ends if the weapon hits a total of three targets.

When cast using a spell slot of 2nd level or higher, the damage is increased by 1d6 per level and you can select an additional target for the weapon to hit.