Turn to Shadow

You touch a creature, turning them into a shadow for the duration. During this time, they can only use the stat block of a shadow, all their gear transfers with them, and when the spell ends they transform back into themselves with all their gear, along with anything they were carrying as a shadow. If they reach 0 HP as a shadow, then they transform back into their normal form with no HP missing, and the spell ends. If the creature that you chose is unwilling to undergo this transformation, then they must make a charisma saving throw against your spell save DC to be unaffected by the spell.