- Japanese: 遺言の仮面
- Kana: ゆいごんのかめん
- Romaji: Yuigon no Kamen
- Translated: Mask of Testament
This is not a physical card, but part of the effect of "Masked Beast of Guardius". When "Masked Beast of Guardius" is destroyed, "Mask of Possession" could be attached to a monster, allowing the controller of "Mask of Possession" to control that monster.
- Takes control of equipped