Mori de Seijo wo Hirotta Saikyou no Kyuuketsu-hime Musume no Tamenara Kuni de Moassari Horoboshimasu! - Ch. 2

[Slingerman]

This is the sort of thing that would be adamantly impressed upon each new generation of royalty. Something must have gone seriously wrong. But I guess this answers the question of why so many nations were destroyed.