Abyss

Abyss (アビス) is a mysterious place which was stated to be a place where those who go suffer a fate worse than death. Anyone whose count reaches zero will be sent into the Abyss.

It's later revealed that the Abyss is actually a ruined Japan country due to the Abandonment War, there live a bunch of children who were not chosen by Althing. Due to the lack of resources, the Abyss has only a few people living in it. The country is ruled by Sakai Tokikaze, the King of Abyss and the Blink Baron.

Unlike Althea, Abyss still has some Modern Technology such as nuclear weapons and airplanes.