You tear a line in the ethereal plane where violent undead creatures can reach out and attack for a brief moment. Each creature in a 30 foot line must make a Dexterity saving throw. A creature takes 3d6 necrotic damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.