|Occupation:||Death Nightmare under Death Vulcan and Dark Cain|
|Associates:||Count Dracul, Magi Saint Germain, Olam Tiphareth, Elyon Yesod|
|First Appearance:||Last Dracul Saishuu Shou - Chou Wakusei Death Vulcan no Fuuin|
Roi Malkuth was a character in the Dracul arc of the Sailor Moon musicals. She appeared for the first and only time in Last Dracul Saishuu Shou - Chou Wakusei Death Vulcan no Fuuin, where she was played by Ado Endou. Unlike previous Death Nightmares, who were simple underlings of more important villains, Roi Malkuth and her fellow Nightmares were powerful spellcasters, and showed themselves to be strong enough to withstand even Sailor Planet Super Attack.
Their true allegiance was unclear in the musical, though their stated purpose was to destroy life on Earth. Count Dracul revealed that they were the ones responsible for the fact that Death Vulcan had such great powers even though he was merely a torn up planet. They also claimed to be the ones behind the entire conflict. In the end, they disappeared into the underworld, along with Dracul and his brother Dark Cain.
- As with many of the other villains in the Dracul arc, the Death Nightmares' names were derived from Biblical and Kabbalistic sources. "Roi" is one of the names of God in Judaism, and "Malkuth" is the tenth Sephiroth in the Tree of Life.