Xingtian...Out!

Before Huan Yi's return to Qin, the Barbarian Subcontinent housed 1.7 billion people. But following the Qin Wars of Unification, only 900 million remained—with the Gorefiend Trees of Zhao acting as the most explicit reminder of the Qin Fiends' ferocity.

Fiends, yes, because after these Wars of Unification, half the Extreme Plateau now saw the Qin as ferocious fiends hell-bent on devouring the world. 

The darkness and negativity generated by the Wars of Unification pooled at Huan Yi's feet, feeding him with a continuous stream of evil. Over 700 Xingtian Slayers now surrounded the Autarch—all shrouded in dark-purple flames. The Kantan population alone was responsible for 300; proof that even in the best environment, Slayer production always became smoother with Huan Yi's involvement.