Cube of Cold

You unleash a blast of cold air. Each creature in a 320-foot Cube originating from you makes a Constitution saving throw with a Difficulty Class of your Spell Save DC + your spellcasting ability modifier, taking 7d10 Cold damage on a failed save or half as much damage on a successful one. A creature killed by this spell becomes a frozen statue until it thaws.

Using a Higher-Level Spell Slot. The damage increases by 1d10 with a level 9 spell slot.