Originally Posted by
Darian[Supercell]
When we introduced the Clan War Leagues, we hadn't even started development on the Season Challenges yet. We knew early on that we wanted to War Leagues to start on the first day of every month, as it was easier to manage in our internal game calendar, especially so when we coordinated with ESL for their qualifiers leading up to the World Finals.
However, when we developed the Season Challenges, given that they last an entire calendar month, it's kind of unavoidable at this point as we're not likely to change the War Leagues start date. While the goal wasn't to leave you with resources you had to sit on and not use while the Leagues are running, we do put in Book of Heroes in order to help mitigate that overflow a bit.
One of the objectives with the Season Challenges was to allow players to carefully plan out how they utilized the items they received, whether they're on a Gold or Silver Pass.