The new booster set for Union Arena features Eren Jaeger, Levi, and the Titans from the hit anime series Attack on Titan.  Players can build a Red Eren deck and Blue Levi deck that both have strong cards, including the SR card for Levi that potentially allows up to three attacks. The set also has chase cards with signatures of Japanese voice actors from the series on them.

This set consists of 35 commons, 35 uncommons, 18 rares, 12 super rares, and 6 Action Point cards. Packs come with 12 cards and displays come with 16 packs. There will also be a pre-constructed starter deck available for this set. The starter contains 50 cards, 3 Action Point cards, a playsheet, and a promo pack. Starter deck displays come with 6 decks.

UVS Games has also been releasing TCG booster product using the Attack on Titan IP (see "'Attack on Titan' Booster Set"). It is notable that UVS will release a new Attack on Titan booster set on May 16, 2025 (see "'UniVersus CCG: Attack on Titan - Apocalypse'"); thus both companies will be releasing a TCG booster set for this IP in the same calendar year.