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The Curse of Balal (バラルの呪詛,Bararu no Juso?) is a "curse" that hinders humanity's ability to communicate and reach mutual understanding. In the distant past the rulers of humanity, known as the Custodians, remodeled Earth's moon into a device that emitted the Curse of Balal and blocked our shared language. Ever since the loss of the Unified Language, humanity has suffered through numerous conflicts.