Living Carapce

This living armour moves seamlessly in concert with its wearer. With a thought, the wearer can secrete growth hormones into these plates, thickening them, repairing damaged sections and making them nigh invulnerable.
At the start of your turn, a model with this Relic regains 1 lost wound. In addition, when resolving
an attack against this model, add 1 to the saving
throw (invulnerable saves are unaffected).