Bob's Stinky Sword

You create a sword-shaped line of force that hovers within range and smells of sour milk. 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 force damage equal to 3d4 + your spellcasting modifier. 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 or another creature within 5 feet of it.