The most important goal of Chuling, Yuan, and Hei Yang's deliberate control of the number of Small Universe-levels was to stabilize the rule and kill all unstable factors that might resist. From this deduction, it meant that if about 10 Small Universe-levels worked together, they might threaten their safety.
10 Small Universe-levels could threaten the safety of Yuan, Hei Yang and Chuling who were at their peak. In that case, how many Small Universe-levels could threaten them when they were seriously injured? Three? Or five?
This number was unknown, but if 10 Small Universe-levels were gathered together, they would definitely be able to kill the severely injured Yuan. That was for sure.