Mithral Bard in agile breast plate how bad the spell failure?


Rules Questions

Grand Lodge

A bard /cleric wears Mithral Agile breast plate and a medium shield.
1. The bards spells can be cast with no chance of spell failure
because the Mithral acts as on lighter than normal for purpose of movement
and other limitations. So treat it as light armor for spell failure.
2. The Mithral agile breast plate is a Medium armor greater than light so The full spell penalty applies 25% minus 10% for the Mithral giving The bard a 15% chance of spell failure with her bard spells.


"Most mithral armors are one category lighter than normal for purposes of movement and other limitations. 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."

Bards cannot offset the ASFC of medium armor. Agile Breastplate has a ASFC of 25%, which mithral reduces by 10%, so his final ASFC is 15%.

EDIT: I may be wrong though!


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Pathfinder Adventure Path, Rulebook Subscriber

I disagree with Dispari.

"This decrease does not apply to proficiency in wearing the armor."

Is not relevant. The bard in question is proficient with Medium Armor from his levels of cleric.

The Mithral Breastplate is treated as light for other limitations, the bard could then cast in the Mithral Breastplate without penalty.

Grand Lodge

Bondoid is correct. Mithral Agile Breastplate is only treated as medium for the purposes of proficiency, and ASFC is not related to proficiency at all.


Bondoid is right. To be honest proficiency is irrelevant. For example a pure bard in Mithril breastplate would be able to cast spells, because it counts as light, but would take the ACP penalty to attacks etc. because he isn't proficient.

Grand Lodge

Thank you everyone


I just feel like adding: a bard wearing a mithral breastplate (agile or not) with the Armor Expert trait, while still not proficient in the armor, will not take any penalties at all. Well, none from the armor.

Sovereign Court

Zathyr wrote:
I just feel like adding: a bard wearing a mithral breastplate (agile or not) with the Armor Expert trait, while still not proficient in the armor, will not take any penalties at all. Well, none from the armor.

Yep - my PFS bard does just that! Heck - if traits are available - every character in the game proficient with light armor proficiency can do this trick in order to wear mithril breastplate without burning a feat. (and don't bother with agile in that case)


Charon's Little Helper wrote:
Zathyr wrote:
I just feel like adding: a bard wearing a mithral breastplate (agile or not) with the Armor Expert trait, while still not proficient in the armor, will not take any penalties at all. Well, none from the armor.
Yep - my PFS bard does just that! Heck - if traits are available - every character in the game {redacted} can do this trick in order to wear mithril breastplate without burning a feat. (and don't bother with agile in that case)

Only penalty would be to classes that that can't cast arcane spells in any armor without ASFC, or classes that have abilities that require no armor worn at all(i.e. monk flurry and armor bonuses).

Dark Archive

I think if the Bard was made entirely of Mithral that he would have a hard time casting spells at all.


unless he was a warforged

The Exchange

Victor Zajic wrote:
I think if the Bard was made entirely of Mithral that he would have a hard time casting spells at all.

Is that what that meant? I assumed 'mithral bards' were a new archetype, possibly inspired by heavy metal music.

Presumably, somebody wrote:
Ungodly Racket: You can produce a hideous noise from your instrument in combination with an incoherent lyric to cause all creatures within 120' who are in the Middle-Aged, Old or Venerable age category to make a Will save. Those that fail must immediately move away from the ungodly racket and, if at all possible, put soundproof barriers between yourselves and them. This is a mind-affecting compulsion effect. This archetype feature replaces fascination.

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