1. Various actions, including killing monsters and collecting materials will increase your character’s fatigue. Fatigue gets automatically reset once a day.
2. Fatigue affects the amount of XP your character gain. Your character earns reduced XP when the fatigue level reaches 75%, and cannot earn XP when the figure reaches 100%.
3. Resting in the Tent or using the Anti-Fatigue Potion from the shop (temporarily removed) can reduce fatigue.