Armor Proficiency, Light (Combat)Modifier
You are skilled at wearing light armor.
Benefit: When you wear a type of armor with which you are proficient, the armor check penalty for that armor applies only to Dexterity- and Strength-based skill checks.
Essentia: You reduce the Armor Check Penalty by -1 / Essentia (minimum 1) and the Arcane Spell Failure by -5% / Essentia (minimum 0%) This apply only to Light Armor
Normal: A character who is wearing armor with which he is not proficient applies its armor check penalty to attack rolls and to all skill checks that involve moving.