Living Stoneskin
Heavy Armor (Plate Armor), Very Rare (Requires Attunement)

This Plate Armor appears to be made of stone slabs carved with alien symbols. It is strangely warm to the touch. To attune to this item, you must wear it for the entire Attunement period, during which the stone plates fuse with your skin.

While wearing this armor, you have a +1 bonus to Armor Class, and you have Resistance to nonmagical Bludgeoning, Piercing, and Slashing damage. Additionally, the armor hardens under extreme impact; if you take 20 or more nonmagical Bludgeoning, Piercing, or Slashing damage from one damage roll (after accounting for your Resistance), you are Petrified until the end of your next turn.

Symbiotic Nature. The armor can't be removed from you while you're attuned to it, and you can't voluntarily end your Attunement to it. If you're targeted by a spell that ends a curse, your Attunement to the armor ends, and it detaches from you.

The armor requires fresh blood be fed to it. Immediately after you finish any Long Rest, you must either feed half of your remaining Hit Dice to the armor (round up) or take 1 level of Exhaustion.