Darkness and Gravity

"Darkness," Ning explained, "is far stronger than simply Shadow. Darkness is the power of the shadow, mixed with the vile evil that corrupts all those who use it."

"It was a good thing that it disappeared from this world long ago, but I managed to use it."

Nightblade lay on the ground, reaching for his own shadow. With the sun above him, his shadow was right in front of him, and yet no matter how much he tried to reach for it, he couldn't get access to it.

The Darkness Ning spoke of had completely cut him off from the place he went to when he used his Shadow Movement technique.

Something dark sprung from his own shadow, latching onto his shoulders and arm, pushing him upward. Some of the darkness held him by the chin, pointing it upward until he was looking directly at Ning.

"I am explaining what this is to you," Ning said. "Do you not wish to learn?"