Frost magic from Secrets of Skelos

[Sedric the Hero]

Hi..i just got the second edition Scrolls of Skelos book and i like it...some cool spells..i especially like the Flame spells..certainly not D&D-like spells which i appreciate..though the basic Frost sorcery spell 'Fell of Frost' is a bit confusing as it says it increases the AP of the casters's clothing or his natural AP by 2...doesn't AP mean Armor Piercing..is this supposed to mean DR or Damage Reduction?

 

[Masterporg]

I think they mean't Armour points, not Armour penetration. That's how I interperated it anyway. 2 DR.