
Lyrad the Strange |
If a character is proficient in martial weapons, but not with shields, can they make attacks with the klar without suffering the klars armor check penalty to their attack roll?
Presumably they would still suffer the ACP to all skill checks that involve moving, since they are not proficient in shields.
Would the character still gain the klars shield bonus to AC (if they did not attack with it?
I could not find anything that says you don't get the bonus to AC when using a shield you are not proficient with - only that you suffer the ACP to attack rolls and skill checks that involve moving.

happykj |
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
Non proficient with shield does not affect your shield AC bonus.
I assume attacking with Klar is same as shield bashing with normal spiked shield, so your attack roll will get the penalty.
according to JJ, I think this means that proficient with martial weapon should help you avoid the -4 non proficiency weapon penalty, but you still get penalty for non proficient with shield

Derklord |

Attacking with a shield bash uses the normal weapon proficiency rules, which are compeltely seperate from the shield proficiency rules. In your case, you suffer the -1 ACP applied to attack rolls, unless it's a mithril klar.
Presumably they would still suffer the ACP to all skill checks that involve moving, since they are not proficient in shields.
You always get the ACP to all Dexterity- and Strength-based skill checks. The non-proficiency penalty for armor and shields, as happykj quoted, makes this also apply to attack rolls.

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Since it’s only 1 ACP, being masterwork is enough to remove that penalty. And all magical weapons and armor are also masterwork.
It's -1 to all attack rolls, not just ones with the klar, and on any physical skill check like acrobatics, climb, swim, stealth, etc.
Better to just pay the gold and make it mithral to make the acp 0 instead.