The next time you hit a creature with a weapon attack before this spell ends, the weapon gleams with purple, seemingly radiance as you strike. The attack deals an extra 2d8 necrotic damage to the target. Upon hit, the affected area starts to seemingly decay. The creature must take 2d6 necrotic damage at the end of each turn for 3 turns.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the extra damage increases by 1d8 for each slot level above 1st