You have learned how to cast spells while wearing armor.
Prerequisites
Armor Proficiency (light), caster level 3rd
Benefit
As a swift action, reduce the arcane spell failure chance due to the armor you are wearing by 10% for any spells you cast this round.
Special
If you can ignore spell failure for a category of armor, such as a bard’s ability to ignore spell failure from light armor when casting bard spells, this feat allows you to ignore the spell failure of armor one category heavier as long as you are proficient with that armor.