In the Academy of Heroes building located in the City, you can produce a resource for leveling up heroes β€” Books of experience.

πŸ“š Depending on its level, the Academy produces a certain amount of Books of experience per hour.

πŸ“š The Academy produces only level 1 rarity Books of experience: books of other rarities can be obtained from the Task Board and other sources.

πŸ“š Books of experience accumulate in the Academy up to a certain limit β€” you can collect them at any time by clicking on the icon above the building.

πŸ“š The productivity and capacity of the Academy increase with each new level of the building.

Please note: The Academy can be purchased in the Building Gallery after completing the task Honorable Duel.