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This culture believed that warriors who spent four years inhabiting its paradise were eventually transformed into butterflies that could go between heaven and earth. One story states that 1,600 gods in this myth system were born from a knife thrown from heaven to the earth. This culture's demiurge- like creator gave humanity the ability to doubt things and is a god of duality that resides in the thirteenth and most spectacular of its heavens. Its underworld was home to a mystic lizard that symbolized the earth and inhabits a place called "where the flags wave." Dead souls must journey for four years to reach this culture's lowest level of the underworld, which is the burial site for bones used by one of its gods to create humanity. Another of its afterlifes is ruled over by a namesake rain deity and is called Tlalocan. For 10 points, name this culture whose primary underworld is known as Mictlan.
This culture believed that warriors who spent four years inhabiting its paradise were eventually transformed into butterflies that could go between heaven and earth.
Aztecs [prompt on Nahuatl mythology]