Adventurer ranks go from "F" to "SSS"
All adventurers start at Rank F
Adventurers accept quests (e.g., from the Guild, feudal lords) to complete in order to receive rewards
There are three kinds of quests: normal, emergency, designated
Only adventures Rank D and higher can accept emergency and designated quests
Only Adventurers D rank and above are allowed to travel into a dungeon unless they have permission, as shown with a letter of identification and introduction, from the Guild, feudal lords, or from someone of high nobility
Dungeon classifications go from Rank C to S. There are no dungeons below C rank as all dungeons are very dangerous
Dungeon danger level classifications are usually classified by the danger level of the final boss of the dungeon.
If the dungeon hasn't been fully discovered then the Dungeon danger classification is raised two ranks higher than the majority of the monsters found on the first floor of the Dungeon.
Rank C dungeons are the most beginner
friendly, containing only Rank F to C monsters.
Rank C dungeons have 6 to 10 floors.
One floor of a Rank C dungeon takes around 8
hours to traverse.
The upper floors are filled with Rank E and D
monsters, whereas the lower floors are
filled with Rank C monsters.
The boss on the deepest floor is Rank C.
Rank B dungeons are medium difficulty,
containing Rank D to B monsters.
Rank B dungeons have 10 to 12 floors.
One floor of a Rank B dungeon takes twelve
hours to traverse.
The upper floors are filled with Rank D
monsters, whereas the lower floors are
filled with Rank C monsters.
The boss on the deepest floor is Rank B.
Rank A dungeons are the second most dangerous,
containing Rank B to A monsters.
Rank A dungeons have 15 to 20 floors.
One floor of a Rank B dungeon takes 14 hours to traverse.
The upper floors are filled with Rank B monsters, whereas the lower floors are filled with both Rank B and A monsters with the majority being Rank B.
The boss on the deepest floor is Rank A.
Rank S dungeons are the most dangerous,
containing Rank A to S monsters.
Rank S dungeons have 20 to 40 floors
One floor of a Rank S dungeon 2 full days to transverse.
The upper floors are filled with Rank B and A
monsters, whereas the lower floors are
filled with Rank A monsters as well as 1 or 2 S ranked monsters.
The boss on the deepest floor is Rank S.
Dungeons monsters are inable to surpass the Rank S threshold so instead after reaching the peak of Rank S a magic circle will activate and send the monster or monsters somewhere randomly where it has the highest chance of reaching the next rank in strength. Strangely tho, no monster has ever been teleported to a overly populated area like a city or town.
Any monster that surpasses the Rank B threshold will almost always gain human like intelligence if the monster doesn't already have high intelligence, of course there's always exceptions.