Dungeons & Dragons 5e Element 133 Class Feature: Peripheral Vision

You are so perceptive to your surroundings, that at your instinctive agility lets you dodge out of the way of certain area effects, such as an explosion or a electrical shock. When you are subjected to an effect that allows you to make a 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. Additionally, on a success you may immediately take a reaction to move up to half your speed (Expending a portion of your movement for that round), or make a ranged or melee attack against an enemy.