Cards are arranged into decks for quests and battles. You can have up to 10 cards in a normal deck and 5 cards in a raid deck.
Before the battle starts, one deck is automatically chosen from your deck list based on priority. You can adjust the priority of a deck by up to three; the higher number is chosen first.
There will always be a recommended stat deck that may be chosen if the player does not wish to build their own deck.
Leader[]
You can choose any Eidolon Card to be the leader of the deck. The leader's stats are multiplied by 1.5 in battles and boss encounters.
Sub Leader[]
You can set any Eidolon Card to be the sub leader of the deck. The sub leader's INT stat is multiplied by 1.5 in Battles.