Tarrasque’s hide

Your skin transforms and your size grows incredibly. Your base armor class is 20 and you grow 2 sizes (i.e. You go from small to large or medium to huge) and you are immune to the magic missile spell for the duration of the spell. Any armor you were wearing before you cast the spell vanishes for the duration of the spell. When ever you are targeted by a missile spell, such as ice knife or magic missile roll a 1D6, on a 1 you are affected by the spell as normal, on a 2-5 you don’t take any damage from the spell and on a 6 the spell bounces of your scaly hide, turning the caster into the target.