Armor of Thorns (b)

Armor Class: 17 - Stealth: Disadvantage
Constitution: +1 up to a maximum of 21.
This armor is decorated with small, metal spikes.
While wearing this armor, when a creature hits
you with a melee attack, you may use your
reaction to deal 1d6 piercing damage to them.
Requires Attunement — Beta Artifact