Bigby's Besieging Bolt

As part of the action used to cast this spell and by using your action on each of your turns, you launch a large bolt of force like that fired from a ballista. You can launch the bolt at a creature or object you can see within range. Make a ranged spell attack. On a hit, the target takes 3d10 force damage.

As a bonus action on your turn, you can attack with the weapon at spell range and repeat the attack for the duration.

At higher levels: When you cast this spell using a spell slot of 7th level or higher, the bolt deals an extra 1d10 force damage for each slot level above 6th.