Dance of the Dead

You imbue and empower yourself and your weapon with the power of the dead. All weapon attacks done by you deal an extra 1d6 necrotic damage, and your target has a disadvantage on Constitution saving throw for 3 turns (Not stackable).

This spell's bonus damage increases by 1d6 when you reach 7th level (2d6), 12th level (3d6), and 17th level (4d6).