That Time I Got Reincarnated as a Slime has joined UNION ARENA, arriving as the first Special Booster Pack for the English release. 

Featuring nearly 200 cards with popular characters from Seasons 1 to 3, Rimuru, Shuna, Shizue, Milim, Shion, and Benimaru, You can use the cards to start building a deck right away.

Features a wide range of North America exclusive foil-stamped autograph cards and newly designed cards. Alongside charming newly illustrated artwork, all *** and ** cards include foil-stamped autographs, offering a truly luxurious finish that collectors will find irresistible. In addition, numerous new designs exclusive to North America are also included.

Each Booster Box contains 16 packs, plus a special Box Promotion Pack.

Each Booster Pack contains 12 cards.
There are 4 rarity levels: Common (C), Uncommon (U), Rare (R), and Super Rare (SR), with AP cards included at a low pull rate.
The lineup features a total of 188 card types plus 13 types of AP cards.
Additionally, alt-art cards are also included