Clash of Glaciers

You conjure several icy boulders in a line 100 feet long, which crush anything beneath them. Each creature in the line must make a Dexterity saving throw, tanking 5d6 bludgeoning damage and 5d6 cold damage on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The bludgeoning or cold damage (your choice) increases by 1d6 for each spell slot level above 5th.