Do Mithril armors include the masterwork bonus reduction to armor check penalty? I checked the entry on special substances and it doesn't say anything about it.
Mithral armor is, by definition, always masterwork. The effects of masterwork is included. The armor check penalty is reduced by 3, not by 3+1.
If you look under the Adamantine entry, you'll find all the relevant text:
...and...
Adamantine is so costly that weapons and armor made from it are always of masterwork quality; the masterwork cost is included in the prices given. Thus, adamantine weapons and ammunition have a +1 enhancement bonus on attack rolls, and the armor check penalty of adamantine armor is lessened by 1 compared to ordinary armor of its type.
They weren't quite as explicit with Mithral, but you can presume it follows the same rule; the penalty reduction/bonuses are built into it.
...and...
Spell failure chances for armors and shields made from mithral are decreased by 10%, maximum Dexterity bonuses are increased by 2, and armor check penalties are decreased by 3 (to a minimum of 0).
Damn. There goes my Rogue wearing a Mithril Breastplate idea. Guess I could give him armor expert though.
Well, you could always take the armor expert trait to take off another -1. I think that should cover reducing armor check down to 0 so that you do not find any problems with nonproficiency
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Comfort enchantment reduces the penalty by one as well.what book is Comfort located in troll?
Pathfinder Society Field Guide.
Source Pathfinder Society Field Guide pg. 50
Aura faint transmutation CL 5th
Slot armor quality; Price +5,000 gp; Weight —
Description
Armor of Comfort sheds dirt and sweat as they accumulate, and remains as comfortable as weather-appropriate clothing regardless of environmental conditions. A suit of armor with this enhancement always looks immaculately clean, can be slept in as though it were light armor, and does not cause a penalty to the wearer’s saving throws to resist the effects of extreme heat. In cold weather, it counts as cold-weather clothing. In addition, the armor’s armor check penalty is reduced by 1 (to a minimum of 0).
Construction
Requirements Craft Magic Arms and Armor, endure elements, prestidigitation; Price +2,500 gp