An issue with IA's items and AC Options

[Ardanis]

As you probably know the best AC that a creature can get is -20 (which doesn't include bonuses from dexterity and single weapon style). Any bonus that wants to lower that value is being neglected by the engine (tested).
Now lets see what items IA offers:
1)Huskar Lord's Armor +14 AC bonus (or simply -4, doesn't matter is this case)
2)Supreme Shelter +7
3)Improved Ring of Gaxx +5
4)Talisman of greater protection +2
These already hit -20 minimum and any other AC bonus will be nullified. It's a rough example but it shows the problem well.

However AC bonuses vs single damage type (slashing, piercing, etc) aren't being counted there (tested).

So, unless it was intentional in the first place, I recommend to use four different effects (one for each AC type) instead of one (which gives a bonus against all weapon types).