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→Non-Proficiency and Heavier Armor
=== Non-Proficiency and Heavier Armor ===
Every armor, shield, or clothing has an Armor Check Penalty, though that penalty is sometimes -0. A Masterwork version has the magnitude of its Armor Check Penalty reduced by 1 (to a minimum of zero). Note that Armor over 1000 gp is automatically masterwork. If you are wearing armor or using a shield which you are not proficient in, the armor check penalty of that armor or shield is counted as 4 higher. If you are using an outfit with a total armor check penalty that is greater than your Base Attack Bonus, you can only move at 2/3 speed (rounded to the nearest 5-foot increment). If your outfit has an armor check penalty that is more than 4 more than your BAB, you can't run. If your outfit provides a total armor check penalty that is 10 or more than your BAB, you can only stagger around.
Just because you're proficient in heavy armor doesn't mean that you're familiar with every piece of heavy armor you encounter. Mechanus Armor is very protective, but chances are slim that a character has actually encountered this equipment before. In general, when a character runs into some new armor (as they will from time to time), they will continue to be non-proficient with it for about a day as they "break it in". So to make full use of your new Chitin Carapace, you'll need two things: Medium Armor Proficiency, and a day to practice with your new bug exoskeleton.
