Essentially, battle fatigue occurs after you accumulate a significant number of wounds. The more Battle Fatigue points you have, the more difficult it becomes to heal your other wounds. Battle Fatigue points are not removed when your wounds are healed; they can only be erased by relaxing in the company of skilled Entertainers. When you find an Entertainer performing, target that character, access their radial menu and select Listen or Watch (or type /listen or /watch). The longer you spend enjoying the performance, the more Battle Fatigue points you will lose. Your total Battle Fatigue points can be checked on the Character sheet under the Status tab.