Review Detail of maniac_008 in Arcane Academy: The Divine Extraction Legacy

The novel is really enjoyable. There are certain parts that I find are not explained properly or are skipped entirely so I hope it does not stay that way, but nothing major. The only problem I find is that, I have read up to chapter 140 but the power ranking system has still not been explained properly. There are mention of first, second and third class spellcasters as well as something called paragon, but there is no explanation of how these classes/level of power is comprised. What are the requirements or conditions to be considered such. I hope the author can give an explanation on this.