Tormenting Pike

You brandish the weapon used in the spell's casting and make a melee attack with it against a creature. On a hit, the target suffers the weapon attack's normal effects, and the first time it attacks a creature other than you before the spell ends, it takes psychic damage equal to your spellcasting ability modifier.

At Higher Levels. At 5th level, the melee attack deals an extra 1d8 psychic damage to the target on a hit, and the damage the target takes if it attacks another creature other than you increases to 1d8 + your spellcasting ability modifier. Both damage rolls increase by 1d8 at 11th level (2d8 and 2d8) and 17th level (3d8 and 3d8).