- The TV anime protagonist's partner Digimon are gathered!
Starting with "Digimon Adventure" Digimon from the TV anime over the years are here as cards! With the cards in this booster's lineup, you'll be able to strengthen previous decks based on the various protagonists as well as [ST-20] and [ST-21]!

- The 2 champions from Digimon Liberator are back!
From Digimon Liberator, which is nearing it's second year, the former champion Owen Dreadnought, and current champion Zenith are back alongside their respective partner Digimon Elizamon and Ragnamon!

- Includes an illustration Celebration Pack (tentative)!
This BOX purchase bonus contains 6 new Digimon cards illustrated by the same illustrator! The top 6 Digimon from the "Which card do you think is the coolest?" pole results announced at DIGIMON CON 2024 are featured on these cards.

- Alt-Art lineup includes some that are English ver. exclusives!
Some of the Alt-Art cards in the lineup are designed by illustrators outside Japan and will only be included as Alt-Art cards in the card lineup for the English ver. of the product.
*A few of the card types will have different illustrations based on the language ver.

- Seven popular illustrators are providing new illustrations with autographs for Alt-Art cards!
This Booster includes newly designed versions of previous cards. These cards will be foiled and include the illustrator's autograph!

- Includes a super rare Serial Number too!
Like the previous Special Booster ver2.5 [BT19-20], BT21 will also have a serial number card included at a low rate! Will you be able to get your hands on the super rare card with a printed serial number?!