The sixth Kirin Scion, Wang Tianpeng, had put in a tremendous amount of effort over the past forty years to train his two extraordinary soul disciples. He not only concealed his identity while taking them to fight against the geniuses of various Integration-level sects but also secretly took Jiang Xixue and Nalan Feng to other Holy Lands to kill several Divine Transformation stage cultivators who were causing trouble.
Throughout the entire process, as their master, he did not intervene but watched from a distance as Jiang Xixue and Nalan Feng battled those initial and mid Divine Transformation stage cultivators.
Why go to other Holy Lands to kill Divine Transformation stage cultivators? Because the Divine Transformation stage cultivators within their own Holy Land were affiliated with the sects of their Holy Land and were considered their own people. As long as they didn't betray the Holy Land or collude with external demons, the Holy Land wouldn't care even if they killed a hundred people a day.
Killing the Divine Transformation stage cultivators affiliated with other Holy Lands was of no consequence since they weren't their own people.