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The core innovation in Idle Champions of the Forgotten Realms is the party composition system. Many of the heroes have abilities that improve the damage of allies or themselves based on the formation they are marching in the party. Further, as the heroes progress, they can choose new abilities to acquire, often with mutually exclusive conditions for their benefits. This changes the core gameplay of the game from passively acquiring progress to managing a party in order to optimize the rate of progress, which helps immensely with getting more entertainment mileage out of a smaller number of mechanics.
It’s also worth noting that separating the progression into campaigns allows for resets that add different constraints such as formations or level goals to keep that aspect of the game novel as well. As more heroes are added through events and updates, the game is poised to become more interesting as experimenting for better party compositions for each type of formation gains more potential options.