Arcanist's Sword

You create a glowing sword-shaped plane of force that hovers within range. It lasts for the duration. When the sword appears and as a bonus action on subsequent turns, you can give the sword a command:

Attack: The sword will move up to 20 feet toward a creature and attack it, making a melee spell attack. On a hit, the target takes 3d10 + your spell casting ability modifier force damage on hit.

Guard: The sword will move up 20 feet toward a creature. It grants half cover to the creature while it shares that creature's space as it attempts to deflect incoming attacks. The first time a hostile creature comes within 5 feet of the sword, it will attack that creature, making a melee spell attack. On a hit, the target takes 3d10 + your spell casting ability modifier force damage on hit. It cannot attack again until you issue a command again.

Spin: The sword will move up to 20 feet toward a point, when it reaches that point it will begin to spin in a deadly whirl. Creatures that start their turn in the sword's space, or enter it for the first time on their turn within 5 feet of the sword must pass a Dexterity saving throw, or take 4d10 force damage.

Source: Kibbles' Casting Compendium