The Adventure theme is the first theme in the game, and the only theme that does not need to be unlocked by climbing ranks. The cards in this theme are based off of the children's "adventure" personas. These are based on the theme of cowboys, indians, or pirates.
In gameplay, this theme focuses on dealing heavy damage with both single target and area of effect abilities and spells.
Adventure currently has 31 Playable cards, making it the largest theme in the game.