Card Trivia:Erebus the Underworld Monarch
- This is the cover card of Structure Deck R: Advent of the True Monarch/Emperor of Darkness Structure Deck.
- This monster appears in the artworks of "Pantheism of the Monarchs" and "Reawakening of the Emperor".
- This monster's silhouette appears in the artworks of "Domain of the True Monarchs" and "The First Monarch".
- This monster's name is based on Erebus, the god of darkness in Greek mythology.
- According to the lore of Yu-Gi-Oh! Master Duel, this monster is the leader of the elemental Monarch monsters, watching as they reign destruction over various lands.
