Armor Optimization (CGH)

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When a gladiator reaches 5th level, he gains an understanding of how his armor can better serve him. Most characters who wear armor simply allow it to bear the brunt of most blows, relying on the physical barrier to protect them from the dangers of battle. They do not know that their armor can protect them to an even greater ree.
Gladiators must rely on armor to protect them far more than the average person. They have to be much more aware of the armor's capabilities. A 5th-level gladiator learns to position armor so it absorbs blows better than it would normally, forcing the heavier parts of the armor to take the main impact of the blow. A shield can be positioned so that the weapon skitters off harmlessly rather than slamming directly into the shield.
Of course, as the gladiator progresses in experience, he continues to understand armor better and better. Every five levels, the gladiator gains a +1 bonus to Armor Class. Thus, at 5th level, the gladiator gains a +1 bonus. At 1 Oth level, this becomes a +2 bonus, and so forth for every level divisible by five.
If the gladiator is not wearing armor or using a shield, this bonus does not apply. Also, armor spells or rings of protection do not gain such bonuses. This armor optimization bonus does apply to more substantial magical items such as bracers, cloaks, and so forth, for gladiators can interpose these items between their bodies and the blows. This bonus is also cumulative with the Armor Optimization nonweapon proficiency.