Bad Omen is an unusual phenomenon, during which the Sun emits supernatural band of spectrum. In ancient terminology, Bad Omen is a sign from god for the coming of an unfavorable series of events. It occurred during Mathayus, Ari, Layla and Illyrian Fellowship's journey to claim the Sword of Damocles, in the Underworld's Desert which transmogrified into the deadly, Swamp of the Dead, on the occurrence of the Bad Omen, determined by Ari.

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