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image of Duos sacrificing a teammate
==Biography==
[[File:Duos sacrifices Dark Ushebti.png|thumb|left|220px|[[Duos (manga)|Duos]], increasing its power, by sacrificing [[Dark Ushebti]]]]
When the [[High Priests]] partook in [[Priests' ka battle|mock battles]] to strengthen their ''ka'' and improve tactics, Seto summoned Duos. Initially its teammates and their opponents used various abilities to counter each other's moves. Once its teammates, [[Dark Ushebti]] and [[Zerua (manga)|Zerua]] had outlived their usefulness, Seto got Duos to destroy them, since its power increased through sacrifice. With its strength tripled, Duos took out its enemies [[Magus of Illusion]], [[Spiria (manga)|Spiria]] and [[Desert Trapdoor Spider]] in one blow.<ref>{{chapter|Yu-Gi-Oh! Millennium World|13|ref}}</ref>
