Chronomantic Rift

You create a warp in spacetime. While concentrating on this spell, your speed becomes zero. At the time of casting this spell you can choose one target within range. The target makes an Intelligence saving throw or else it loses it's action and movement on it's next turn. Alternatively you can choose to grant that target an additional action and movement on your initiative count for this turn. On subsequent turns you can use your action to repeat one of the two options available. If you lose concentration on this spell because of damage you become stunned until the end of your next turn as the chronomantic energy rebounds and the warped space collapses.