Card Trivia:The First Monarch
- This card's artwork is a silhouetted version of "Erebus the Underworld Monarch".
- Notably, the design shown in this card predates the reveal of "Erebus" by almost two years. This prototype design is missing a few defining traits, such as the spikes cresting his shoulders. Before this, many assumed the depicted monster was "Caius the Mega Monarch", or an unnamed but lost figure that predated all of the Monarch monsters and now gave them commands from a higher plane. Furthermore, as this monster is a Fiend and "Erebus" is a Zombie, it is implied that his current incarnation is a resurrected form of the monster in this card.
- As a monster, this card's original ATK and DEF are the inverse of that of all non-"Mega Monarchs", and its original Level is also the same as all non-"Mega Monarchs" (except "Zaborg the Thunder Monarch").
- "The Prime Monarch" could be considered to be a counterpart of this card: both cards are Continuous Trap Cards with similar names that can be Special Summoned as monsters with the same ATK and DEF, and one is DARK Fiend-Type while the other is LIGHT Fairy-Type.
