Among them, there are not just level-9 demons, but even level-10 demons.
Levi feared that the two might be discovered by powerful beings, so he decided to have them start from the bottom and blend in.
Through gathered intelligence, Levi learned:
In the Land of Darkness, there existed a supermassive Abyss Well.
It was perpetually guarded by four level-10 demons, rendering it as impregnable as an iron fortress.
The four demons were:
From the 167th layer of the Abyss: Flame Demon Tyrant, Casas;
From the 235th layer of the Abyss: Master of Deep Diving, Shuster;
From the 367th layer of the Abyss: Faceless King, Jupiter Lex;
From the 478th layer of the Abyss: Angry Lord, Coschechi.
These four level-10 entities were dominant figures among the Flame Demons, Bottom-dwelling Fish Demons, Formless Demons, and Sky Anger Demons respectively.
Judging by the layers, the Angry Lord was the strongest.
