Yun Che’s method of cultivation was very simple, but also very extreme and very frightening.
Using the waterfall’s immense power of impact, he completely scattered his own Profound Energy, while also withstanding a substantial amount of trauma that was being dealt to his life force. Then, under this near burnt out state, he exploits and teared apart the limits of his body and Profound Strength.
Because toppling the limit also means advancing a step further.
However during this process, even the slightest trace of inattentiveness would result in immediate death!