Why?
Because Xu Shu knew the strength of the Cao Gang; they were formidable.
The Cao Gang could dispatch warriors of the Third Rank and experts to the Wastelands to execute the task of exchanging sacrifices.
This meant that within the safety zone, there was a very high likelihood of the existence of Third-Rank combat power, perhaps even more than one.
Inside the safety zone, monsters absolutely could not take action, or they would surely face a bombardment from the Star Tower.
For instance, at this very moment, the "Narrow Sleeve Guanyin" hanging off Xu Shu's waist, looking entirely like an inert object, would be killed if she harmed a human.
However, the Star Tower would not interfere in battles among Transcendents.
Unless one courted death and fought inside the Star Tower itself, the Star Tower would not respond; the only risk one would face was accountability from the Judgement Department.
