Xyxlbark Armour

Armor (breastplate, half plate, or plate), rare (optional attunement)
  Armour made from the cured bark of the xyxl tree is stronger and lighter than steel and possesses the unique ability to nourish its wearer. The source of the xyxl tree’s immense durability is the mithral particles it secretes in a rigid lattice throughout its wood. The art of curing the slow growing xyxl bark is known to but a few denizens of the fey lands to which it is native.
  If the armour normally imposes disadvantage on Dexterity (Stealth) checks or has a Strength requirement, the xyxlbark version of the armour doesn’t.
  Optional Attunement. If you attune to xyxlbark armour, it nourishes you, causing you to gain 2 temporary hit points at the start of each of your turns.
  Very rare variant: You gain + 1 to AC while wearing this armour and the number of hit points and temporary hit points gained increases to 3.
  Legendary variant: You gain +2 bonus to AC while wearing this armour and the number of hit points and temporary hit points gained increases to 5. In addition, you can speak and understand Sylvan and can cast the druidcraft at will.