Chen Yi found a Secret Technique Jade Pendant among Tan Qing's belongings,
Chen Yi inspected it briefly and discovered that it contained the same secret skill of transforming into black smoke that he had!
This escape technique was designed for demon cultivators, but Chen Yi could still study and learn from it. Even if he couldn't use it, he could find its weaknesses and know how to deal with such techniques in the future,
Besides, just because Chen Yi couldn't use it doesn't mean others couldn't.
This time, all the wealth accumulated over a lifetime by Tan Qing and Shen Fang, who had murdered and set fires, ended up in Chen Yi's possession.
In theory, Chen Yi could stop running his medical clinic because the spirit stones he gained after dealing with all the spoils of war were enough to buy him the ingredients for five Foundation Establishment Pills,
But, Chen Yi wouldn't do that; sudden wealth would arouse suspicion.