Boulder Dash

Your body becomes covered is stony, armor-like plates, rushing forward at extreme speeds. In a 30-foot long by 5-foot wide line originating from you each creature in that area must make a Dexterity saving throw, taking 6d6 bludgeoning damage and being knocked prone on a failed save, taking half as much damage and not being knocked prone on a success. After damage is dealt, you are transported to the end of the line.