Death's shadow

By touch, you transfer a small amount of negative energy directly to a creature that attacks and disrupts their vital organs before dissipating . you touch a living creature and that creature must succeed on a constitution saving throw or take 5d6 necrotic damage. This damage is regained after 1 minute if the target doesn't fall unconscious.

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