Robin Burton is a young man who grow with everything anyone can hope for, immense talent for cultivation, sharp mind, a wealthy family that will stop at nothing to protect and nurture him. He had everything except the willingness to take them. "Why would I take the same route as my ancestors ? why should I become stronger? to beat this and compete with that..?! THAT IS NOT WHAT I WAS BORN FOR!!" Robin didn't want to compete with young masters, so he made an army and started invading planets.
The day after Robin's conversation with Sage Albert, he summoned Caesar, Zara, and 4 mid-leveled knights to his palace, as the seventh session began...
"AAAAAAAAAAAAHHHHHHH"
After a few months' absence, Caesar's screams shook the administrative area again
But it was nothing compared to the first few times.
After Caesar experienced the gray flame and knew for sure that he was getting stronger, and after going through this painful experience a few times already...
his screams became noticeably milder, his resistance became weaker, and not even once from start to finish of this session did he beg Robin to stop
Another reason is that Zara has become level 12 and the amount of energy she is pumping into Caesar's back has also increased significantly!