Chillburn

A flash of light streaks toward a creature of your choice within range. Make a ranged spell attack against the target. On a hit, the target takes 2d6 fire damage and 2d6 cold damage, and the next attack roll made against this target before the end of your next turn deals an additional 1d4 fire damage and 1d4 cold damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.