Eldritch Wake

The first time you hit with a melee weapon attack during this spell’s duration, your weapon glows with eldritch energy, and the attack deals an extra 2d6 Necrotic Damage to the target. Additionally, a 15 foot long, 5 foot wide line of necrotic energy lashes out from the impact originating from the target in a direction the caster chooses. Any creature caught within this line must succeed a Dexterity saving throw against your spell save DC or take 1d6 Necrotic Damage.

At higher levels. When you cast this spell using a spell slot of 3rd or higher, the damage dealt by this attack increases by 1d6 for each slot.