Sequence of Thrones: Calamity Finale

The story takes place in an apocalyptic world that is constantly invaded by "pollution" and "disasters". Humans and other intelligent races have built the last fortress on the ruins, the core of which are the thirteen cities with the "Thirteen" strong men as their patron saints. The pinnacle of power is the "Throne Level" strong ones, and their enemies are the terrifying existences called "Forbidden Rulers" (immortal taboos). Their strength is divided by "eyes", with the highest being "Pseudo Order Level". The entire world is divided into the relatively safe "outer world" and the disaster-ridden "inner world" (Heavenly Abyss). The boundary between the two is maintained by the lives of the thrones of the past dynasties.