Allemande

You can use a bonus action to toss this magic sword into the air and speak the command word. When you do so, the sword begins to hover, flies up to 60 feet, and attacks one creature of your choice within 5 feet of it. The sword uses your attack roll and ability score modifier to damage rolls.

While the sword hovers, you can use a bonus action to cause it to fly up to 60 feet to another spot within 60 feet of you. As part of the same bonus action, you can cause the sword to attack one creature within 5 feet of it.

After the hovering sword attacks for the fourth time, it flies up to 60 feet and tries to return to your hand. If you have no hand free, it falls to the ground at your feet. If the sword has no unobstructed path to you, it moves as close to you as it can and then falls to the ground. It also ceases to hover if you grasp it or move more than 60 feet away from it.

This sword is a +2 magic sword, (+2 to attack and damage) and crits on a 19 or a 20. 

This sword is soul bound to you, and as such contains a fraction of your own soul.  If this sword is more than 120 ft from you for one half day (sunrise to sunset), you will permanently loose 1d4 health.  You will continue this loss daily until you drop to 0 health, in which you soul will be permanently bound for eternity to this blade.

Proficiency with a Rapier allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Melee Weapon Attack: Piercing, Damage: Piercing, atomatically if slot is open, at which point this becomes soulbound., Damage, Combat, Finesse, Vex