This skull has jet-black jewels embedded in its eyes and an off-white pearl at its base.
You may use an action to toss this skull in a space within 20 feet of you and speak its command word, turning it into a skeleton. This skeleton is perfectly obedient to you, and you can command it telepathically. It takes actions on your turn, and you control its actions.
While the skeleton exists, you may use an action to speak its command word and cause it to explode, killing it immediately and forcing all creatures within 10 feet of it to make a DC 12 Dexterity saving throw, taking 2d6 piercing damage on a failed save and half as much damage on a successful one.