Ok, so there is one thing that really bothers me in the Arena. All my opponents seem to have unexplained extra bonuses. I tried it back on normal difficulty, and they always have extra stat point, even if they shouldn’t. And since I’m not benefiting of ANY stat bonus from the kingdoms lvl 10 in my arenas, that means said bonuses come out of nowhere. Either these are the kingdom bonuses, in which case I should get mine too (and it didn’t happen in a single arena), or they should have none. As I said, I tested it in the basic normal difficulty to make sure of it, and I can confirm my opponents and their troops all get stats buffs. Thought it was worth mentioning.
Edit: just added a screenshot from current arena in normal difficulty to show what I mean - no bonus for me, but bonuses for my opponent. (I only thought of doing it after I already attacked the hero once, sorry.)