Dungeons are automatically generated, with characters being strengthened via cards they can garner from treasure chests and as rewards for ranking up, among other means. The parameters of the cards you obtain in treasure chests are determined at random.
When exploring dungeons, you can share information with other players. You can also team up for battles.
There wlll also be a card fusion system to strengthen and evolve your cards.
Thanks, Hachima Kikou.