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Frieren: Beyond Journey's End - Episode 3 discussion : r/anime

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 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.