The necromancer compels a creature in range to perform a sudden, jerking motion.   The target makes a Charisma saving throw, and on a success is unaffected by this spell.   The motion performed must either cause the creature to move an additional 5" (or fly 10" if the creature has that ability) or to interact with one object or feature of the environment for free.   Any motion caused by this spell does not consume any action, reaction, or movement the target would otherwise be afforded.