Boulder Bash

You place a pebble on the ground, transforming it into a large boulder and with a mighty shove launch it forward. The boulder rolls in a straight line 10ft wide and up to 120 ft long in a direction you choose before rolling to a stop, stopping early if it impacts against a solid surface which isn't destroyed by the impact. Every target in the line must make a Dexterity saving throw. A target takes 10d6 bludgeoning damage on a failed save, or half as much damage on a successful one.
The boulder deals double damage to objects and structures.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 4th.