It had been based on what people remembered, but they were able to gather a lot of information that way.
One of them was the Grades of the attacking monsters.
�It starts with those at Grade 3 and below. Then the Grade 2 monsters will come. Finally, the Grade 1 monsters will attack. Of course, Grade 1 monsters are the strongest.�
That was why there was talk in the future about whether this pattern was some sort of training for humans to be able to fight against the unranked monsters.
Of course, the reality was hell for it to just be training.
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