Chaos Armor

This set of armor swirls with a multiverse of
intoxicating colors, and transforms to an armor
type you are proficient in wearing.While wearing
it, any critical hit against you awakens the armor:
Roll a d20 to create a random effect. Unless
otherwise stated, the armor retains this effect
until replaced by another roll, or you complete a
short or long rest.
The bearer of this armor must hope for the best,
and still prepare for the worst.