Slow

You alter time around up to six creatures of your choice in a 40-foot cube within range. Each target must succeed on a Wisdom saving throw or be affected: its speed is halved, it takes a -2 penalty to AC and Dexterity saving throws, and it can't use reactions. On its turn, it can use either an action or a bonus action, not both. If it tries to cast a spell with a casting time of 1 action, roll a d20: on an 11 or higher, the spell takes effect on the creature's next turn instead. A creature can repeat the saving throw at the end of each of its turns.