The so-called Flawless Realm is the pursuit of both the physical body and dharma form being flawless.

It's like polishing a jade, to achieve a state of complete perfection without blemish requires a lot of effort.

Fortunately, Divine Tree Little Loli, while pondering over the source of the Way of Heaven on the Ascending to Immortality Platform, accidentally took some because she forgot to turn off the automatic pickup. (No offense intended, just a joke)

These sources of the Way of Heaven are the purest things in the Immortal Realm, even more effective than the Immortal Essence cultivated through hard work.