Arcane Sword

Level: 7

Casting Time: 1 action

Range: 60 feet

Duration: Concentration, up to 1 minute

You create a sword-shaped plane of force that hovers within range. It lasts for the duration. When the sword appears, you make a melee spell attack against a target of your choice within 5 feet of the sword. On a hit, the target takes 3d10 force damage. Until the spell ends, you can use a bonus action on each of your turns to move the sword up to 20 feet to a spot you can see and repeat this attack against the same target or a different one.

Source: PHB, page 218. Available in the SRD (as "Arcane Hand").