Eldritch Arrow Volley

Upon rubbing an arrow in crushed wild berries and reciting an incantation the arrow is imbued with the arcane ability to multiply and rebound round a group of targets within certain range parameters. Make a ranged spell attack against the target. On a hit, the target takes 2d10 force damage, up to 4 other targets within 10 feet of this target must make a wisdom saving throw equal to your DC. On a fail they are hit with the arcane arrows seeking out a new target. These additional targets take 4d6 necrotic damage 

The spell damage increases by one of each die when you cast it at higher levels: two additional dice per additional level spell slot used.