in the case of the arena, it might be more effective to use not 2 heroes, but 3, i.e., two of them have roughly equal strength armies, and the 3rd (the boss :)) is stronger than them, thus bypassing the auto-battle. I agree with Alex_R on this issue, as I also believe that the battle should be conducted "manually" - in my humble opinion, this is very important.
Also, regarding the verification: I would like to see an "example," i.e., a kind of masterclass on verifying the saves of people who have already done this.
Sincerely.