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: Frieren explains to Fern that in the decades since Qual was sealed, human mages studied his spell. They eventually "standardized" it, incorporating its principles into humanity’s own offensive and defensive magic systems.

Twenty-eight years after the death of the hero Himmel, the elf mage Frieren and her apprentice Fern travel to the trading city of Waal. Frieren's true goal in this region is to check on a seal holding back an ancient, powerful demon named , known as the "Elder Sage of Corruption". : Frieren explains to Fern that in the

The story highlights the and the advancement of human knowledge . While Qual remained frozen in time, humanity spent eighty years analyzing and overcoming the greatest threat of the previous era, turning a legendary terror into a textbook exercise. Frieren's true goal in this region is to