Aphazard's Snow Flurry

When a creature you can see within range takes damage from a spell, you can use your reaction to cause flumes of powdery snow to warp the spell's nature in that instant. The damage becomes cold damage, and you can add or subtract 1d8 from the damage dealt.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage you add or subtract increases by 1d8 for each slot level above 1st.