This is a Cman which gives everyone a little bit of extra protection from death crits. Redux is awesome and Squares may use it but not really need it as much. This will give those with the skill a moderate level of crit protection on any area. A magician may wish to develop strength and toughness to their casting hands. Another of any class may want head protection. Nerves probably would be out. A running bonus something like +2 per rank up to Heavy. Your head or left arm or abdomen is permanently protect with stacked results. Even if it's +1 not +2 per rank it's still good opportunity for CM points to be used well.