This suit of armor is reinforced with adamantine, one of the hardest substances in existence. While you're wearing it, any critical hit against you becomes a normal hit.
Killing Strike. When you roll a critical hit while wearing and attuned to this armor, you deal an additional 12 (2d10) necrotic damage on that attack.
Abyssal Ambiance. While attuned to this armor, when a creature completes a long rest they must take 12 (2d10) psychic damage, that cannot be reduced in any way. Each night the wailing of those trapped in the abyss echoes in the mind of the wearer, grating on their psyche over time.
Flee From the Light. When this armor is hit by an attack that deals radiant damage, the armor dissipates into smoke for 4 (1d6) hours.
Plate consists of shaped, interlocking metal plates to cover the entire body. A suit of plate includes gauntlets, heavy leather boots, a visored helmet, and thick layers of padding underneath the armor. Buckles and straps distribute the weight over the body.
Notes: Immunity: Critical Hits, Damage: Necrotic, Combat, Warding, Str. 15 Required, Stealth Disadvantage