This page will be updated when necessary.
Ranks go from F- all the way up to SSS+
Before ranking up, all characters must train from untrained to the foundation establishment level 10 realm. Once level 10 is reached, characters can call on the system for a rank-up test, which, if passed, will power up a foundation establishment level 10 character to F rank while giving access to a character's experience bar. Once the experience bar reaches 100 percent completion, the character can prompt the next system rank-up test, which, if passed, will take them to the next rank. Characters can't die in a system rank-up test until the S rank test. During the S rank test and above, any injuries incurred during the rank-up test actually occur.
The first 10 percent of the bar is designated as the minus of a rank, while the last 10 percent is the plus section. An example of this is if a character is F rank, the experience bar will take 100 points to complete. If your experience is 10 or lower, you would be an F- rank, while 90 or above would be an F+ rank. The experience bar doubles after every rank up until S rank and above, in which it then begins to triple.
Nobles test their kids' aptitude at 16 during the coming-of-age ceremony, while commoners are tested once they're 16 as well, but all at once on the first day of summer. During the aptitude test, characters are given a letter from F- to SSS+. Each aptitude rank has a multiplier on the amount of experience points a character receives from everything, from intensive training to killing a tough opponent. An example would be two F rank characters, both slaying an F rank beast. One of the characters has SSS+ aptitude, which has a 30x multiplier on experience and gains 15 experience points, while the other character with F rank aptitude, which only has a 1x multiplier, would only get .5 experience for the exact same kill. Experience for killing anything significantly weaker than a character is diminished greatly. The aptitude test also tests for the rare mage aptitude, which only 5 percent of humans possess, along with their elemental affinity. Mages' experience bars work in the same manner as magic knights, and so does aptitude. Mages can also pursue the magic knight experience bar along with their mage bar, but magic knights with no affinity for the mage system can't become mages. Pursuing both systems of power simultaneously halves your experience multipliers, slowing progress in both.
Rank does influence power via larger mana pools for mages and stronger bodies for magic knights, but the difference in victory or defeat can also be influenced by things like spell mastery, more powerful spells, and ingenuity, etc. For magic knights, sword techniques, sword arts, movement abilities, among other things, can contribute to a weaker-ranked character winning or fighting to a standstill with a character with a higher rank, or two characters being the same rank, but there's a large gap in abilities between the two.
That's all I have for now, thanks for reading