Tarrasque Kin

Your ancestors have made a deal with a Tarrasque which grant you the following benefits:

Tarrasque skin: As a bonus action you can activate Tarrasque skin which increases your AC to 25 which last for 3 of your turns. You need to long rest before using this ability again. 

Reflective Carapace: As a reaction any time you are targeted by a magic missile spell, a line spell, or a spell that requires a ranged roll, you impose disadvantage on the damage rolled. you may use this effect a number of times equal to your proficiency bonus.