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Overava, which in Guaraní means shiny, makes reference to the treasures hidden underground in Paraguay in the mid-19th century, during the Triple Alliance War. According to folk tales, the owners of these valuables never unearthed them because they were cruelly killed during the war. However, their greed condemned their spirits to keeping watch over them. Lights, trees with blue flames, headless dogs and white animals show up at night during bad weather.