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That thing is still at the Legendary Level.
Although its size is unimaginably large, it is still within the confines of Rank 8 Legends and hasn't surpassed this level.
While strength and size can determine the level of power, it is not absolute; there are plenty of creatures with large bodies but weak strength.
Of course, the terrifying size of this creature is not for show; otherwise, it wouldn't seem to be eradicating a Nightmare Realm overseen by a Child of Nightmare all by itself.
From what can be seen now, most of the Nightmare Creatures within this Nightmare Realm seem to have been devoured by that monster; it's now hammering at the core of the Nightmare Realm. In the Divine Territory, that would be equivalent to hammering at the God Country where Lin Xiao's True Body resides.
"I hope that Child of Nightmare drops dead soon!"
