Secrets of Eternity is the third Booster Pack in the Yu-Gi-Oh! ARC-V era.

It introduces the "Infernoid" and "Raidraptor" archetypes, and contains further support for the "Qliphort", "Shaddoll", "tellarknight", "Yosenju", "Nekroz", "Ritual Beast", "Performapal", "Superheavy Samurai", as well as many other archetypes. It also contains other cards from the ARC-V anime.

The OCG version of this pack includes support for the "Symphonic Warrior" and "Crystal Beast" archetypes, whilst the TCG version includes support for the "Burning Abyss" and "U.A." archetypes.