Fatigue is the natural result of overwork and not enough rest. It can also be induced by various herbs mixed into potions which interfere with the body's basic processes.
Fatigue I: Dash costs an additional EP and characer cannot take Reactions.
Fatigue II: Fatigue I and character cannot take Special Actions.
Fatigue III: Fatigue II, Character must pass a DEM saving throw against the Area DC in order to perform any Action.
Fatigue I: 1 Earth, 1 Air, 1 Water
Fatigue II: 2 Earth, 2 Air, 2 Water
Fatigue III: 3 Earth, 3 Air, 3 Water