Chapter 6 - My middle name is Arthur OR oops I overdid it a bit

For the part about rank. It's used by the mages and the human as classification. But while the rank 1 of humans and mages are the same, the rest does not match, given that each rank for mages is representing a different stage (and system for some) of magic power. The rank 2 of mages is the equivalent of the rank 5 of humans, the rank 3 is the equivalent of the rank 15, the rank 4 is the equivalent of the rank 30, and so on. Of course, the normal humans reach a maximum rank of 20 (lifespan issue), while the mages get some additional lifespan for each increase in rank. The speed of progress however slows down quickly after each rank, so they eventually die of old age. The power of Merlin, able to fight against all the gods at the same time, is said to reach the rank 100 of mages at least.