There is an urban legend about a secret dungeon in LINK VRAINS. It's packed full with dangerous traps. And what waits at the other end is...
But if we clear this, we may 
acquire the Cyberse Deck.
Aber wenn wir es lösen,
erhalten wir womöglich ein Cyberse-Deck.
Pero si lo resolvemos,
podríamos obtener un deck Cyberse.
Mas se vencermos isso, vamos
conseguir o Deck do Ciberverso.