Wet Floor

You cause a 20-foot square area of ground centered on a point within range to become wet and slippery. When the spell is cast, each creature standing in its area must succeed on a Dexterity saving throw or fall prone. Any creature who starts their turn in, ends their turn in, or attempts to move more than 10 ft. in one turn within the spell's area must also succeed on a Dexterity saving throw or fall prone.