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The Six Heroes were six powerful mages who were involved in the Fengumi War that occurred forty years prior to the series.
The Fengumi War also known as the magical war was a battle that occurred between mankind and the fellows of the evil gods who invaded from outer space 200 years ago, prior to the series. Although it is said that they were destroyed without anything that human beings would normally do, the war had a miraculous causality, where the six strong mages with great talent and strength were gathered in one era with great deviation from the human standard called "six heroes". Humanity was able to survive with the result of some of the heroes death.