They all knew there was something off about Myrah's granny by now. There was the fake happy smile of Myrah at Ravi, which screamed ' I will be an adult, and carry the burden of these dark secrets.' . Then there's the clear proof that Myrah's grandmother worked for Odin, the root of all evil according to current news.
Even if nothing is said, they knew why the land in between hundred bases and divine land is called the land of spirits. It's because most of the evil sorcerers and cruel warlords established their dens in that area. The big countries survived as a single entity with their large military in early days. As such, hundred bases and divine land both have marked borders. Every small country in the south east was crushed to rubble. The dead piled up like hills, the rivers ran red, monsters infested every inch.
