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Remember, mitheral armor doesn't reduce the armor's weight class for proficiency purposes. So, mitheral medium armor is still considered medium armor and if you're not proficient, you take the armor check penalty to attack rolls.
So the stats for a mitheral breastplate become:
Cost: 4200 gp
AC Bonus: +6
DEX Bonus: +5
Armor Check Penalty: -1
Spell Failure: 15%
Speed: 30 ft.
Weight: 15 lbs
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You can ignore the spell failure chance for your Bard spells, as a mithral breastplate is light armour. It COUNTS as medium armour for proficiency purposes, and since you don't have medium armour proficiency you'll take the (-1) armour check penalty on attack rolls when wearing it.
I recommend some way to reduce the ACP penalty to zero (there's a trait for that!) or get that medium armour proficiency. Shame to waste a feat on it. Might want to consider a dip into a class that grants medium armour proficiency.
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There's an armor special ability (Comfort, it's in the PFS Field Guide) that reduces ACP by 1, so a Mithral (not Mitheral) Breastplate of Comfort has an ACP of 0.
This was a tricky question. Since you have Armor Expert, your armor check penalty would be zero, so there wouldn't be any consequence for non-proficiency that I can find. Also, your Defender of the Society trait would still apply -- adding +1 to your AC -- because it's still actually medium armor. (Which is why you still need to be proficient with medium armor or suffer the consequences... that you cleverly eliminated.)
Most mithral armors are one category lighter than normal for purposes of movement and other . Heavy armors are treated as medium, and medium armors are treated as light, but light armors are still treated as light. This decrease does not apply to proficiency in wearing the armor. A character wearing mithral full plate must be proficient in wearing heavy armor to avoid adding the armor’s check penalty to all his attack rolls and skill checks that involve moving.
ETA: I agree that you would be able to cast your bard spells in a mithral breastplate without incurring a spell failure chance. I think that a mithral breastplate is medium armor treated as light for purposes of limitations -- not light armor treated as medium for purposes of proficiency -- but my conclusion is the same.
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Nice catch. This is, of course, easily fixed by replacing Armor Expert with the regional trait Sargavan Guard. ;)
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So, In short, mithril medium armor counts as light for movement, encumbrance, and arcane spell failure, but it`s still a medium armor, so you gain any benefit derived of that. Is that OK?
James, you are right, I don´t realize that, I have to take the regional trait.
Actually, to tweak your first sentence a bit (and it may be easier to think of this way): mithral breastplate armor is LIGHT armor, though you still need to be proficient in medium armor to avoid the armor check penalty to attack rolls.
Would Mithril Breastplate ruin Evasion for a rogue?, and would It matter If the rogue took medium armor proficiency or not?.
A Rogue can use Evasion in Mithril Medium Armor, but if he lacks the Medium Armor proficiency he will suffer the normal non-prof. penalties to STR and DEX skills (etc.).
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Would Mithril Breastplate ruin Evasion for a rogue?, and would It matter If the rogue took medium armor proficiency or not?.
No, because Mithral Breastplate is light armor for limitations; the lack of proficiency only means that you include the armor check penalty to attack rolls, it is not a limiting factor in class abilities that are dependent on an armor's weight class.
EDIT: Ninjaaaaaaaaaaaaaaaa'd!
Actually, to tweak your first sentence a bit (and it may be easier to think of this way): mithral breastplate armor is LIGHT armor, though you still need to be proficient in medium armor to avoid the armor check penalty to attack rolls.So, In short, mithril medium armor counts as light for movement, encumbrance, and arcane spell failure, but it`s still a medium armor, so you gain any benefit derived of that. Is that OK?
James, you are right, I don´t realize that, I have to take the regional trait.
@HangarFlying: I understand that most people prefer to think of it that way; but that's not what the rules say, and it makes a difference with the Defender of the Society trait in the OP's question.
@Miguel Madrid del Ama: That is close, but not broad enough. Mithral medium armor counts as light for limitations aside from proficiency. You need to keep it vague because of other random implications, like the question of Evasion that Blue Minotaur raised.
The point is that mithral is awesome, like the chain shirt that Bilbo gave to Frodo. The material gives a benefit in every way possible; but the item is still what it is, whether chain shirt or breastplate.
There's a link in one of my earlier posts. It seemed familiar, but I couldn't quite place it; turns out that it's from the Faction Guide.
Defender of the Society is also on d20pfsrd's traits page. Just do Ctrl + F and search for it..
Yes, Mithral Bplate + Armor Expert (or that other trait) is a great and wonderful combo.