I am not sure if this would be allowed, for instance Med Fort on a shield and Heavy on Armour, Crit "resistance" would be about 87.5%. OR is this a case of like bonuses not stacking so only best Fort would apply, at 75%? I guess I am not clear as to what the Fortification property is considered to be!
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This is very, very similar to a problem I had with a player recently. They had the equipment Mistmail
When mirror image is cast, 1d4 images plus one image per three caster levels (maximum eight images total) are created. These images remain in your space and move with you, mimicking your movements, sounds, and actions exactly. Whenever you are attacked or are the target of a spell that requires an attack roll, there is a possibility that the attack targets one of your images instead. If the attack is a hit, roll randomly to see whether the selected target is real or a figment. If it is a figment, the figment is destroyed. If the attack misses by 5 or less, one of your figments is destroyed by the near miss. Area spells affect you normally and do not destroy any of your figments. Spells and effects that do not require an attack roll affect you normally and do not destroy any of your figments. Spells that require a touch attack are harmlessly discharged if used to destroy a figment.
An attacker must be able to see the figments to be fooled. If you are invisible or the attacker is blind, the spell has no effect (although the normal miss chances still apply).
How we handled it was as follows: First, the attacker made an attack roll. If successful, they would then have to roll a miss chance for Mistmail. If that succeeded, we did a die roll for which one of the images was hit, or if the player was hit. We followed this method for multiple reasons.
1) It was much easier math
And 2)Concealment bonuses themselves do not stack with each other. Mirror Images doesn't give you a "Concealment bonus", but it does pretty darn close to the same thing.
When making a melee attack against an adjacent target, your target has concealment if his space is entirely within an effect that grants concealment. When making a melee attack against a target that isn't adjacent to you, use the rules for determining concealment from ranged attacks.
In addition, some magical effects provide concealment against all attacks, regardless of whether any intervening concealment exists.
Concealment Miss Chance
Concealment gives the subject of a successful attack a 20% chance that the attacker missed because of the concealment. Make the attack normally—if the attacker hits, the defender must make a miss chance d% roll to avoid being struck. Multiple concealment conditions do not stack
With multiple fortifications, as they are from different sources, treat them as such. Roll the crit negate percentile for your shield, then your armor. As for what kind of bonus it is, fortification is an enhancement bonus, just like a flat +1 to a shield or armor would be. They are the same bonus and bonus type, yes. But they will both work at the same time, as one is going to your shield and one is going to your armor. Saying otherwise means that you couldn't wear a belt of Giant's Strength and have a +1 sword, or a headband of alluring charisma and a +1 shield.
