Drop Anchor

You summon a massive ship's anchor in the air above an enemy.  The target must make a Strength saving throw or be crushed.  If the creature fails, they take 8d8 bludgeoning damage and are restrained.  If they succeed they take half as much damage and are not restrained.  At the end of each of its turns, the target can make another Strength saving throw.  On a success, the target frees themselves and is no longer restrained.  Additionally the anchor has a large chain attached to it, which you can, as part of casting the spell, attach the other end to an unsecured huge or larger object.  The anchor weighs 500 pounds.

At Higher Levels: When you cast this spell using a 5th level slot or higher, the damage increases by 1d8, and the weight increases by 250 pounds for each slot level above 4th.