Embrittlement

You fire a blast of freezing energy that engulfs your target, freezing it solid. Choose a creature or object within range, a creature must make a constitution saving and on a failed gains vulnerability to all damage for the duration and can repeat the saving throw and the end of each of its turns. On a successful save the target takes 3d10 cold damage and the spell ends.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the cold damage increases by 1d10 for each slot level above 5th.