In Nie Li’s view, Bronze and Silver rank are very easy to breakthrough. It is slightly more difficult to breakthrough into Gold rank. However, it’s not an unbreakable door. With Xiao Ning’er and the rest’s cultivation techniques, breaking through into Gold rank is extremely easy. All they need to do is to accumulate their soul force and they can breakthrough.
As for Nie Li himself, due to the fact that he is practising the [Heavenly God] technique, the difficulty for him to breakthrough is several folds harder than others. Although the difficulty has been increased by several folds, it’s not too difficult.
He was absorbing the soul force in the Blood Crystals and then refined it to his own, which allowed his soul realm to constantly expand, and was giving him a swelling feeling.