Clown Car

Inexplicably summon a clown car, which flies through a spontaneously opened portal from Clownspace, targeting a creature you can see within 60 feet of you. The clown car commits attempted murder on the target, hitting them at top speeds. The targeted creature must make a Dexterity saving throw. On a success the target takes 5d6 bludgeoning damage halved. On a fail an affected creature takes 5d6 bludgeoning damage and is knocked prone and grappled.
The clown car then spawns 3d4 Space Clowns, who shamble out of the vehicle and begin kicking and punching the whoever was knocked prone. At the start of the affected creature's turn, they take 2 bludgeoning damage per clown, and must succeed on a strength saving throw in order to break the cycle, taking continued damage at the start of each of their turns until they break the cycle. A creature that breaks the grapple must use all of their movement to run in any direction away from the group, and becomes frightened of clowns for the rest of their lives. If the target of this spell is already afraid of clowns, they instead take two stacks of exhaustion. 
If a creature is reduced to 0 hit points during the brutal mugging, the clowns frantically feast on the target, leaving nothing but bones behind before stumbling back into the car and driving away. When this occurs, you restore 1d4 levels worth of spell slots.

When this spell is cast at a higher level, an additional 1d4 clowns appears from the car per level cast above 6th level.