Dreadnought Plate Armor (5e Equipment)
From D&D Wiki
Armor (plate), legendary
Some short lived races, such as humans, have some of their people spend most of their life using magic and a special type of forge to create compresses adamantine. The stuff is many times harder than adamantine, but that is not all. The longer lived races, such as elves, continued to compact compressed adamantine into compact adamantine. Finally, they enchant the compact adamantine to guard against all spells and physical attacks.
Dreadnought plate armor weighs 130 lbs. While wearing this armor, any critical hit against you counts as a normal hit.
In addition, the Dreadnought plate armor has 500 hit points. While the armor has more than 0 hit points, while you are wearing it you are resistant to damage dealt by weapon or spell attacks. When you take damage from such an attack, the armor takes the same amount of damage.
If the armor has more than 0 hit points, it regains 50 hit points daily at dawn.