You conjure a spectral whip in your hand that remains for the duration. It counts as a simple melee weapon in which you are proficient. The whip deals 1d4 magical bludgeoning damage +  your strength/dexterity modifier and has the finesse and reach properties. While holding the whip it can be used in the following ways:

Lash. When you take the attack action while holding the whip, you can cause the whip attacks to have a reach of 20 ft and do extra damage equal to your spellcasting modifier.

Crash. As an action, you can use the whip as a lasso and strike at a creature within 10 ft . The creature must make a Strength saving throw. On a failure, the creature is thrown 20 ft towards you and takes 4d8 bludgeoning damage. On a successful save, the creature is unaffected.

At Higher Levels. When you cast this spell using a 4th spell slot or higher the bludgeoning damage increases by 1d8 for each slot level above 3rd.