
Grick |

Does an wizard (or any caster for that matter) incur the normal spell failure chance if he is multiclassed in say fighter for example?
Yes.
Also, instead of multiclassing, could you take the (Medium/Heavy) Armor Proficiency feat to negate the spell failure chance?
No.
Armor proficiency and Arcane Spell Failure are unrelated.

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Does an wizard (or any caster for that matter) incur the normal spell failure chance if he is multiclassed in say fighter for example?
yes
Also, instead of multiclassing, could you take the (Medium/Heavy) Armor Proficiency feat to negate the spell failure chance?
no
look at the feats Arcane Armor Training and Arcane Armor Mastery.
Also some classes allow for arcane spell casting in light armor (bard, magus and summoner), but only for those classes, eg, if you had sorc5/bard5 wearing leather armor the bard spells would not have a spell failure chance, but the sorcerer spells would
EDIT: half ninja'd, damn you grick

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So in essence, aside from some archetypes, there is no way to change armor proficiencies for most classes?
You can gain armor proficiency just fine. Take a level of fighter (or whatever) or spend some feats. It's just that being proficient in armor doesn't let you avoid arcane spell failure chance.

Grick |

So in essence, aside from some archetypes, there is no way to change armor proficiencies for most classes?
Anyone can gain armor proficiency by taking the feats.
This is what proficiency does:
Nonproficient with Armor Worn: A character who wears armor and/or uses a shield with which he is not proficient takes the armor's (and/or shield's) armor check penalty on attack rolls as well as on all Dexterity- and Strength-based ability and skill checks. The penalty for nonproficiency with armor stacks with the penalty for shields.
I suspect you mean arcane spell failure, not proficiency. There are feats for that, too, that Skerek mentioned above.
You can also reduce the chance of Arcane Spell Failure for metal armors by 10% by making them out of Mithral.
This is what Arcane Spell Failure is:
Arcane Spell Failure Chance: Armor interferes with the gestures that a spellcaster must make to cast an arcane spell that has a somatic component. Arcane spellcasters face the possibility of arcane spell failure if they're wearing armor. Bards can wear light armor and use shields without incurring any arcane spell failure chance for their bard spells.
Casting an Arcane Spell in Armor: A character who casts an arcane spell while wearing armor must usually make an arcane spell failure check. The number in the Arcane Spell Failure Chance column on Table: Armor and Shields is the percentage chance that the spell fails and is ruined. If the spell lacks a somatic component, however, it can be cast with no chance of arcane spell failure.

Cratai |

Cratai wrote:So in essence, aside from some archetypes, there is no way to change armor proficiencies for most classes?You can gain armor proficiency just fine. Take a level of fighter (or whatever) or spend some feats. It's just that being proficient in armor doesn't let you avoid arcane spell failure chance.
Right, that was the underlying question. I just phrased it poorly.
Finally, is there any such concern for divine casting? I realize there is no divine casting spell failure chance, but are there any other complications I should be aware of (concerning divine casting and armor class)?

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Jiggy wrote:Cratai wrote:So in essence, aside from some archetypes, there is no way to change armor proficiencies for most classes?You can gain armor proficiency just fine. Take a level of fighter (or whatever) or spend some feats. It's just that being proficient in armor doesn't let you avoid arcane spell failure chance.Right, that was the underlying question. I just phrased it poorly.
Finally, is there any such concern for divine casting? I realize there is no divine casting spell failure chance, but are there any other complications I should be aware of (concerning divine casting and armor class)?
That's one advantage of divine spellcasting - armor doesn't interfere at all. The only thing close to that is the restriction druids have against wearing metal armor.