Electric Fence

You create an invisible, spherical perimeter around a point you can see within range. The area had radius of 15 feet. Whenever a creature would enter or leave this area without teleporting, the spell delivers an electrical shock.

An affected creature must make a Constitution saving throw. On a failed save, the creature takes 3d8 lightning damage and until the beginning of their next turn, its speed is reduced to 0 and it cannot gain any bonuses to its speed. This occurs before the creature crosses the threshold. On a successful save, the creaure takes half damage and its movement is not impeded.