Brawler's Gold

Brawler's Gold is a currency used to purchase items from Ulaani and  Tiana Nevermorn at the Brawler's Guild.

Source
The currency is obtained in a number of different ways.
 * Around 100 from Brawler's Purse
 * 1 from watching a fight
 * 5 guessing correctly while talking to Lord Winifred Browne