Always lost when carrying more than a light load.
Normally lost when wearing any armor. Can improve to light armor (as scout) or medium armor (as barbarian).
Classes: Barbarian (1st), monk (3rd, 6th, 9th, 12th, 15th), scout (3rd, 11th)
Prestige Classes: Fist of the forest (1st), forest reeve (1st)