Ethereal Shard

 You hurl a shard of soul energy at a creature, and on a hit the target takes 1d6 necrotic or psychic damage. The target must make a Constitution saving throw on a hit. On a failed save, they take an additional 1d6 necrotic or psychic damage and are marked for the duration.

• While marked, they take 1d4 additional necrotic damage whenever they take damage from a melee or ranged attack. The damage increases by 1d4 every 5 levels.

At higher levels: 5th (2d6), 11th (3d6), and 17th (4d6).