Armor of Eternus

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. Creatures that make an attack against you and fail to hit you have their movement speed reduced to 0 for the next 2 rounds. While wearing this armor you have a swim speed of 30 and no longer need to breathe. All spells or attacks that deal cold damage deal an additional 3d8 cold damage. 

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, Bonus: Armor Class, Combat, Warding, Str. 15 Required, Stealth Disadvantage