Adventurer Rank is a measure of how powerful your character is. You start at Adventurer Rank 100. Moving upward (or rather, "downward", as lower numerical ranks are better) in rank means a higher salary every fifteen days, and a new title. It should be noted that Adventurer Rank is the best way to increase your monthly salary, because it pays more than any other rank. (60 gp per rank per pay period.) However, you also get fame at the same time as Adventurer Rank, which significantly increases taxes in standard Elona. (This does not apply in Elona+, where you are taxed solely upon current gp.) Keep in mind that your adventure rank will, in fact, decay over time, if you stop clearing dungeons.