Bladelure

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects and has its focus magically drawn towards you until the beginning of your next turn, perceiving you to be surrounded in a faint glow.

The target has disadvantage on the next attack roll it makes against a target other than you before the beginning of your next turn. The first time the target makes an attack roll against you before this spell ends, it immediately takes 1d8 psychic damage.

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 when it attacks you increases to 2d8. Both damage rolls increase by 1d8 at 11th level (2d8 and 3d8) and again at 17th level (3d8 and 4d8).