@JeremyECrawford regarding Ray of Frost – if this is cast on a creature with a movement rate of 10', can it move at all – or is it frozen?
— mrbornac (@mrbornac) September 13, 2017
If your speed is 10 ft. and ray of frost reduces it by 10 ft., your speed is now 0. #DnD https://t.co/Fta7cNcbYF
— Jeremy Crawford (@JeremyECrawford) September 13, 2017