Grimstaff
Explorer
Instead of the percentile adjustment to armored arcane casting penalty, how about just giving the class the same armored casting ability as the Bard?
"Bards are proficient with light armor and shields (except tower shields). A bard can cast bard spells while wearing light armor without incurring the normal arcane spell failure chance. However, like any other arcane spellcaster, a bard wearing medium or heavy armor or using a shield incurs a chance of arcane spell failure if the spell in question has a somatic component (most do). A multiclass bard still incurs the normal arcane spell failure chance for arcane spells received from other classes."
Same effect with less math, and the player can upgrade to medium armor with feats from Complete Arcane if he wants to later down the road.
"Bards are proficient with light armor and shields (except tower shields). A bard can cast bard spells while wearing light armor without incurring the normal arcane spell failure chance. However, like any other arcane spellcaster, a bard wearing medium or heavy armor or using a shield incurs a chance of arcane spell failure if the spell in question has a somatic component (most do). A multiclass bard still incurs the normal arcane spell failure chance for arcane spells received from other classes."
Same effect with less math, and the player can upgrade to medium armor with feats from Complete Arcane if he wants to later down the road.