Chromatic Weapon

You create a floating, spectral weapon within range that lasts for the duration or until you cast this spell again. You choose acid, cold, fire, lightning, poison, or thunder for the type of weapon you create. When you cast the spell, you can make a melee spell attack against a creature within 5 feet of the weapon. On a hit, the target takes damage of the type you chose equal to 1d8 + your spellcasting ability modifier.

As a bonus action on your turn, you can move the weapon up to 20 feet and repeat the attack against a creature within 5 feet of it.

The weapon can take whatever form you choose.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for every two slot levels above 2nd.