Step into the magical world of That Time I Got Reincarnated as a Slime with the Union Arena UE20BT Special Booster Box, an exciting addition to the Union Arena English trading card game series. Featuring nearly 200 cards inspired by Seasons 1 through 3 of the hit anime, this booster box brings fan-favorite characters like Rimuru, Milim, Shizue, Shion, Benimaru, and Shuna to life through stunning card designs and detailed artwork.

Each sealed booster box offers players and collectors the opportunity to expand their collection, discover powerful cards, and build unique decks filled with strategic potential. Whether you’re just beginning your Union Arena journey or strengthening an existing deck, every pack delivers excitement, variety, and the thrill of discovering new cards.

This special release includes exclusive North America foil-stamped autograph cards and newly illustrated designs, making it a standout addition to any anime trading card collection. The premium foil finishes and detailed artwork enhance both the visual appeal and collectible value, creating a truly rewarding unboxing experience.

Perfect for collectors, anime enthusiasts, and trading card players alike, this Union Arena Special Booster Box combines beloved characters, high-quality card design, and exciting gameplay potential. It also makes an excellent gift for fans who want to relive the adventure and build their own story within the Union Arena universe.

• Enter the World of Rimuru and Friends – Relive your favorite moments from That Time I Got Reincarnated as a Slime with nearly 200 beautifully designed cards featuring beloved characters like Rimuru, Milim, Shizue, Shion, Benimaru, and Shuna. A must-have for anime fans and trading card enthusiasts.
• Build Powerful and Unique Decks Instantly – This Special Booster Box gives you the exciting opportunity to start building your own deck right away. Whether you’re a beginner or experienced player, each pack brings new strategies, surprises, and endless possibilities.
• Exclusive Foil-Stamped Autograph Cards – Discover the thrill of pulling North America exclusive foil-stamped autograph cards. These stunning cards offer a premium look and feel, making every opening a memorable experience collectors will truly treasure.
• Stunning Artwork That Brings the Anime to Life – Enjoy newly illustrated card designs that capture the charm, emotion, and energy of the anime. Each card is crafted with incredible attention to detail, making your collection feel special and meaningful.
• Perfect for Collectors, Players, and Anime Lovers – Whether you’re expanding your UNION ARENA collection, enhancing your gameplay, or searching for the perfect gift, this sealed booster box delivers excitement, nostalgia, and collectible value in every pack.