"What exactly is Evil Qi?"
For most people in this world, this might not be a question that needs pondering. After all, when you kill someone, the weapon absorbs Evil Qi — it's almost as much a common knowledge as jumping into a well leads to drowning.
Common knowledge is naturally indisputable, just like two plus two always equals four, or how leaves will eventually fall to the ground no matter how much they flutter. These are things people take for granted, and very few question common knowledge.
But rare doesn't mean nonexistent.
After all, delving deep into this matter might touch on the fundamental operations of the world, and such a level of information often implies formidable power — hence, there are always those willing to spend time and energy to study this matter, attempting to uncover the true nature of the so-called Evil Qi.
Among them, the most outstanding was the ancient Chu Kingdom.
