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... living being, demon beasts had their own ranks. But compared to humans, they were absolute monsters—three to five times stronger at the same rank
They're divided into a few ranks ranging from low-level demon beasts to catastrophe-level demon beasts.
The low-level demon beasts are equivalent to the F and E Rank, the intermediate ones to C and D Rank while the high-level ones are equal to the A and B Rank.
And then, there were the Named Demon Beasts—S-rank monsters.
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