Arcane Boing

You transform a spring or metal piece into a small sized arcane infused spring at a point within range. The spring violently extends and targets two squares adjacent to the point of origin. These squares must be within 5 feet of the spring, and must also be on opposite sides of the spring. Each creature in the target squares must make a Strength saving throw or take 3d6 bludgeoning damage and be pushed 15 feet in a straight line away from the spring. A successful save negates half the damage, and the creature is not pushed. 

Alternatively, you may cast this spell and target an object weighing at least 400 pounds or an immovable object like a wall, a ceiling, or floor. The spring uses this object as a brace and extends 5 feet to target the square opposite from the brace point. Any creature inside the target square must make a Strength saving throw or take 3d6 bludgeoning damage, 2d6 force damage, and be pushed 30 feet in a straight line away from the spring. A successful save negates half the damage, and the creature is not pushed. 

At higher levels. When you case this spell using a spell slot of 3rd level or higher, the bludgeoning damage increases by 1d6 for each slot above 2nd level.