Every time I read this manga I always feel like the author just makes shit make as long he goes and yet I got proven wrong because the theme always matched up with the previous antagonist which honestly makes me very impressed. I was expecting the reincarnation plot has be forgotten and was fine...
"Ten Years ago, the sky was shrouded by so much aerial magic that it became hazy... We can't take it to the sky."
Huh, I wonder what happened? Or this is some foreshadowing by author?