Qin Fengming had never truly exerted the full power of the law concept he had comprehended. But after seeing Kou Yuxin activate his earlier, he knew that doing so would inevitably consume a tremendous amount of his own origin.
Even Fellow Daoist Kou, a cultivator at the Mahayana stage, had shown a look of steely endurance after using it, his aura slightly disordered. This was enough to show just how immense the energy required to fully activate it once was.
When cultivators activated their law concepts, they could not borrow Heaven and Earth Origin Energy.
That was because activating a law concept was inherently a struggle with Heaven and Earth for control. Although this struggle was not enough to trigger an attack from the Heaven and Earth laws, it was likewise impossible to receive support from Heaven and Earth energy.
Thus, the Heaven and Earth laws concepts they created were all supported by the cultivators' own energy.
It was precisely because activating one's own law concept consumed a certain amount of magical power, and even one's own origin, that Mahayana cultivators would never easily use this seemingly powerful method in battle.
Although Qin Fengming's magical power and energy were vast and boundless, and he was not much inferior to Kou Yuxin in that regard, his energy was certainly far less pure than Kou Yuxin's.
Naturally, this meant Qin Fengming would need to offer up even more origin energy to support it.
Hearing Qin Fengming's words, Immortal Yun Ling showed no unusual reaction. With a wave of her hand, a jade bottle exactly like the one Kou Yuxin had obtained appeared before Qin Fengming.
"I almost forgot about this. With this Three Releases Heaven Returning Pill, you should be able to go all out, Young Friend Qin."
Immortal Yun Ling glanced