Dark Bead

You create 3 small black beads that seem to sap away the light around them. Each bead targets a creature of your choice that you can see within range. The targets must succeed a Dexterity saving throw or take 1d6 necrotic damage per bead. 

At higher levels. When you cast this spell using a spell slot of 2nd level or higher, the spell creates one more bead for each level above 1st.