Chen Fei didn't look at the Black Demon anymore but instead sensed the changes in his body now.
Breaking through from the late stages of the Rule Integration Realm to the Peak of the Rule Integration Realm truly was a qualitative change.
Moreover, after condensing three Space Secondary Rule Fragments [Big], Chen Fei also condensed eleven Space Secondary Rule Fragments [Small], bringing the count of these Secondary Rule Fragments to thirty-nine.
If Chen Fei wanted to control a second Secondary Rule, he would need to increase the number of Space Secondary Rule Fragments [Small] by sixty-nine.
To cultivate such a number of rule fragments by himself would take Chen Fei more than two hundred days—not overly long, but it indeed required some time.
But now, within these ruins and based on the previous effects of using Rule Crystals, he would not need many—roughly five more Rule Crystals, and Chen Fei could directly master a second Secondary Rule.