Black Arrow

A jet black arrow shoots from your bow forming a line 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Wisdom saving throw. A creature takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one.

The necrotic arrow rots and decays anything it passes through, living plant matter and natural objects wither and die if they were pierced by the black arrow.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.