Druss

To go from 2 to 3 costs 1000 gold
3 to 4 1000 gold
4 to 5 500 gold
5 to 6 400 gold
6 to 7 200 gold
7 to 8 300 gold
8 to 9 400 gold

amount of gold increases with each point of reputation except for 13 and 14 which are lower than the rest.