What Mu Chen didn't realize was that this change was born from his experience creating a world within the Extreme Spirit Pearl by manipulating the clouds of Attributes. Those seven-colored clouds were the purest and most refined manifestation of the Heaven and Earth Primordial Qi. Since he could control the very source of that energy, what difficulty could there be in manipulating the impure Primordial Qi of the Outer Realm?
That was one reason. The second was that as Mu Chen's control over his Spiritual Power became more refined and his creation of the Bead Inner Realm grew more proficient, his ability to manipulate the Primordial Qi of the Outer Realm would become increasingly powerful, and the effects he could produce would grow increasingly strange.
