Dr. Flumph's Imaginary Friend

You summon an Invisible Stalker (the DM has its stats) in a point within range. You can use a bonus action to mentally tell the invisible stalker what you want it to do, and while you maintain concentration, it will begrudgingly do it, including to kill a creature, deliver a letter, or retrieve an object. It can move anywhere on the same plane of existence as you, but if you or it leaves that plane the spell ends early. If your concentration is broken, it simply leaves, and it will stop doing a task if it decides it won’t survive by continuing to do so.