Bitter Touch of Helheim

You touch your target, and have it experience the unholy cold of Helheim. You touch your target, and have it experience the unholy cold of Helheim. The target must succeed on a Constitution saving throw or become as pale as death and take an extra 1d8 cold damage from your attacks for the duration of the spell. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the cold damage increases by 1d8 for every two slot levels above 3rd.