Dark Ones Influence

Calling upon the spiral and it’s Eldritch creatures, you manage to influence a willing creature attack. 

The next melee strike or evocation spell casted by the targeted creature gets an extra 1d6 points of necrotic 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.