You send a creature barreling into its companions, toppling them all. Choose a Medium or smaller creature you can see within range. It must make a Constitution saving throw. On a failed save, it takes 4d8 force damage and is knocked prone. On a successful save, it takes half as much damage and isn't knocked prone. Either way, the creature is then pushed 5 feet in a cardinal direction of your choice that wouldn't cause it to occupy the same space as an inanimate object, if possible. If a creature pushed this way would enter another creature's space, both creatures suffer 1d6 bludgeoning damage, and if the second creature is Medium or smaller and not prone it also suffers the above effects, starting with the Constitution saving throw. You can't choose a direction to push the second creature that would cause it to collide with any other creature that's already been pushed by this casting of this spell. Repeat until the pushed creature doesn't collide with a susceptible creature or can't be pushed in a valid direction.
At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the force damage increases by 1d8 for each slot level above 4th.