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The "Two Faced Calamity, Beleth" was a Title that Luminous thought only meant his change of personality from a calm old man to a bloodthirsty battle maniac.
Or that reflected his powerful Dual Aura, the Golden Aura of Harmony, which protected him from all hits and that could absorb damage and release it as beams, and the Crimson Aura of Wrath, which boosted his physical prowess through the roof.
But there was another secret that the Supreme Gods in the past have faced from Beleth, a terrifying power that even the Archdemons recognized as one of Beleth's strongest powers.
The reason why he had a state of pure serenity and harmony, and another of bloodthirst and wrath was because he was born with two minds, two personalities… two souls.
Beleth has been unique since birth, his soul was two, and both souls had their own personalities.
One was calm and meditative, his Golden Soul of Harmony, a rare occurrence among demons.