Viola's Channel Agony

You are able to use the blood of other creatures to amplify your attacks. When you or a creature within range takes damage, you can use their blood to empower your next attack. The next time you deal damage on your next turn, the target takes an additional 1d10 necrotic damage and the spell ends.

At Higher Levels When you cast this spell using a spell slot of 2nd level or higher, the extra damage increases by 1d10 for each slot above 1st.