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Plate Armor of Etherealness

Armor · Legendary · Attunement · SRD 5.2.1 p. 234

Armor (Half Plate Armor or Plate Armor), Legendary (Requires Attunement)

While you’re wearing this armor, you can take a Magic action and use a command word to gain the effect of the Etherealness spell. The spell ends immediately if you remove the armor or take a Magic action to repeat the command word. This property of the armor can’t be used again until the next dawn.