A Build Divide -Bright- Fate/Grand Order booster box is a trading card game set for the popular mobile game. These boxes contain 16 booster packs, each with 7 cards, and focus on specific Fate/Grand Order story chapters like "Golden Sea of Trees, Nahui Mictlan" and "Fairy Round Table Realm: Avalon le Fae." They include both existing and new illustrations, autograph cards from voice actors (in some sets), and a new "Class Card" mechanic that supports other decks. 
Booster box contents
16 booster packs per box: Each pack contains 7 cards.
Beautiful illustrations: Includes both illustrations from the FGO mobile game and story illustrations that are popular with fans. Some sets also feature newly drawn illustrations by official artists.
Autograph cards: Some sets, like the Avalon le Fae release, feature randomly inserted autographed cards from voice actors.
New "Class Card" feature: A new type of card that can strengthen units or increase energy, providing support for other Build Divide decks.
Varied card types: The box contains a mix of cards featuring servants and characters from the specific FGO chapters.
Randomized contents: The contents of each box are not guaranteed, as specific cards are randomly selected from a large pool of types. 
Available sets
Build Divide -Bright- Fate/Grand Order - Golden Sea of Trees, Nahui Mictlan:
Focuses on the "Golden Sea of Trees, Nahui Mictlan" chapter.
Features servants such as Tezcatlipoca, Tlaloc, and Ereshkigal, as well as characters like U-Olga Marie and Tepeu.
Build Divide -Bright- Fate/Grand Order - Fairy Round Table Realm: Avalon le Fae:
Focuses on the "Fairy Round Table Realm: Avalon le Fae" chapter.
Includes cards of characters like Artoria Caster, Oberon, Morgan, and Melusine.