"For the sake of fairness, and safety too. Just imagine if Grade 4 and Grade 5 Spirit Tools were running rampant and flying all over the place—would this back mountain even survive? Facing a Grade 5 Spirit Tool, how could an ordinary Foundation Establishment cultivator hope to stay alive?"
"What about divine abilities then? Can they be used normally?"
"You're sharp indeed, picking up on that instantly. This pressure places a restriction on Spiritual Power; since it can restrict Spirit Tools, it naturally restricts cultivators from channeling Spiritual Power as well. The maximum amount of Spiritual Power we can mobilize at one time is equivalent to the full capacity of an early Foundation Establishment cultivator."
Chapter 339