Tribulation.

Shi Lang sensed something when his body was gushing with energy. He opened his eyes and found the clouds thundering with golden lightning flicking among them. He looked around and found that Elder Yu was taking everyone back. 

Shi Lang stretched his body, issuing cracks, and the Terran said, "What are you waiting for? Come at me." 

The lightning seemed to be waiting to hear these words and rushed down from the skies. The streak of lightning looked like an angry python opening its mouth to grab the neck of its prey. 

Shi Lang did not back off. He smiled and channeled his cultivation sutra to the fastest speed possible. It was an instant when the streak collided with him. Shi Lang could absorb some of the lightning, but the impact threw him away from the initial spot. The terran shook his head and cleared his dazed mind before he mumbled, "The tribulation of the upper realm is tougher than the tribulation of the lower realm."