Ultra Instinct?

You've been pushed to the brink more times than you can count. As a response, your body has learned to automatically react to a threat.

• When a creature hits you with an attack, you gain AC equal to your dexterity modifier against all subsequent attacks made by that creature until the start of your next turn.
• Gain Expertise in Dexterity saving throws.
• You have advantage on Dexterity saving throws.
• Whenever an attack against you misses, you can move up to 15ft in any direction, doing so does not provoke an Opportunity Attack and you can only do so if your movement is not zero.
  This reduces the amount of movement you have next turn.