Unstoppable Force

You hurl a 1 foot diameter sphere up into the air, and it flies in a 60 feet long and 5 feet wide line in a direction you choose. Each creature in the line must make a Strength saving throw. A creature takes 4d8 force damage on a failed save, is pushed back 30 feet and is knocked prone, or half as much damage on a successful one, is pushed back only 15 feet, and is not knocked prone.

The sphere creates a 1 foot diameter hole in non-magic objects on hit, and pushes loose objects that weigh less than 4,000 pounds back 30 feet. Additionally, if the sphere hits an object under the effects of the Immovable Object spell or similar effect, both the objects are disintegrated if the objects are non-magical.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 and adds an additional 10 feet of knock back for each slot level above 3rd.