Death Throw

If a creature dies within 15 feet of you, you can pull from the negative energy and send a blast of power against a target within range.

Make a ranged spell attack, on a hit the target takes 2d10 necrotic damage. 

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