Harry Potter - Secrets of Hogwarts

You cast a fully encompassing protego around yourself, sacrificing durability for coverage. For the duration, you have a +3 bonus to AC, including against the triggering attack. If you are subjected to an effect that allows you to make a Strength or Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw and only half damage if you fail.