2014 Version

Level School Range / Area Components
3rd Level Abjuration 60 ft S
Duration Casting Time Attack / Save Damage
Instantaneous Reaction None None

You attempt to interrupt a creature in the process of casting a spell. The creature must make a Constitution saving throw. On a failed save, the spell dissipates with no effect, and the action, Bonus Action, or Reaction used to cast it is wasted. If that spell was cast with a spell slot, the slot isn’t expended.