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The Demon Hierarchy
The demon world follows a strict hierarchy, from simple demonic spirits up to the ten Demon Lords gathered within the Octagram.
Minor demons: spirits spontaneously born from the astral plane, with varying power.
Primordial Demons: the very first demons to appear, with considerable power (Diablo, Testarossa, Ultima, Carrera).
Demon Lords: a title granted to beings who have reached a catastrophic level of power.
Octagram: an informal council gathering the ten most powerful Demon Lords in the world, including Milim, Guy Crimson, Ramiris, Leon and now Rimuru.