The Aura King.
It was a title given to the strongest ki user of a generation. Sometimes, the heavenly title could skip generations as some generations were considered useless and irredeemable.
Hence, one could imagine Reve's shock when he finally absorbed what Nikan said, "I see. He was stopped at [Ki Conversion]."
[Ki Conversion] was not a rank of ki mastery. Instead, it was something had to start learning from the moment they were able to manipulate ki. It was usually a long process but most would be done by the time they become a ki master.
"Yes, I just said that," stated Nikan.
"If it as you say, then perhaps my mind doesn't want to move on and is clinging on to something important?" analyzed Reve.
He had thought of that before but, at this moment, it held more meaning than the last time.