Card Trivia:Rune-Eyes Pendulum Dragon
- This card is the cover card of Secrets of Eternity, and it is the first Fusion Monster to be a Booster Pack's cover card since "Dragon Knight Draco-Equiste" of Duelist Revolution.
- This monster's appearance looks like a combination of "Odd-Eyes Pendulum Dragon" and "Stargazer Magician", which is fitting as these were the monsters Yuya used to Summon it the first time.
- This card is similar to the "Number C" monsters from Yu-Gi-Oh! ZEXAL as, initially, it did not exist within the owner's Extra Deck, but it is created during a Duel when it is Summoned for the first time.
- This monster's cry is similar to the Crimson Dragon's cry.
- Apparently, this monster has the ability to fly, as shown in its debut in Yu-Gi-Oh! ARC-V episode 023: "A Date With Fate: Part 2". However, in Yu-Gi-Oh! ARC-V episode 026: "Battle Between Buddies: Part 2", it instead jumped over a fissure to help Yuya grab an Action Card.
- This card is the only "Pendulum Dragon" Fusion Monster to specifically list "Odd-Eyes Pendulum Dragon" as one of its Fusion Materials.