Plate Armor of Etherealness
Armor (plate), legendary (requires attunement)

While you're wearing this armor, you can speak its command word as an action to gain the effect of the etherealness spell, which last for 10 minutes or until you remove the armor or use an action to speak the command word again. This property of the armor can't be used again until the next dawn.

Plate. 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.

Stealth. The wearer has disadvantage on Dexterity (Stealth) checks. 

AC: 18
Stealth: Disadvantage
Weight: 65