During the battle at the Sky Curtain Battlefield, Number One, in its primordial form, was powerful enough to fight against two Great Demon Kings of the Early Titan period.
Not to mention now.
Jack Clark wasn't surprised by this scene; it would be more accurate to say that Number One was recovering from 'injuries' rather than growing by devouring the flesh, blood, and souls of living beings.
He only hoped that Freya Louise could withstand the surge of power from Number One's growth, otherwise, he would have no choice but to destroy it.
As Jack Clark's gaze traversed over twenty thousand kilometers and observed the increasingly terrifying aura of Number One, it seemed to sense the 'killing intent' from him, and the dark-gold creature suddenly turned its head to look in his direction.
Roar! Looking at the indifferent young man with black hair in the sky, Number One let out an extremely vicious roar, its eyes flashing with an ever more terrifying blue-white light.