Animate Weapon

You target a melee weapon within range that is not worn or carried by a conscious creature other than you, and cause it to levitate, acting as an extension of your will for the duration or until you cast this spell again. When you cast this spell, you can cause the weapon to move up to 20 feet and make a melee spell attack against a creature within the weapon’s attack range. On a hit, the target takes 1d8 + your spellcasting ability modifier damage. The type is of the normal damage dealt by the weapon. Any additional bonuses to damage are still gained unless the effect requires attunement, and you are not attuned to the weapon. 

While the weapon is animated, on each of your turns you can use a bonus action to move the weapon up to 20 feet and repeat the attack against a creature within the weapon’s attack range. At any time, you can end this spell to return the animated weapon to your hand.

An enemy can attempt to gain control of the weapon by using its action to make a Strength (Athletics) check against your spell save DC. On a success, the creature gains control of the weapon and the spell ends.

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