Armor Check Penalty
Mechanic (Armor)
- Source: Core
While wearing armor with which you are not proficient, you take an armor check penalty on attack rolls as well as skill checks made using the following skills: Acrobatics, Climb, Endurance, Initiative, Jump, Stealth, and Swim. The type of armor worn determines the size of the penalty: light. -2; medium, -5; heavy, -10. Additionally, you do not gain the armor's equipment bonuses. For example, a character not proficient with light armor who dons a suit of stormtrooper armor takes a -2 penalty on attack rolls and certain skill checks. In addition, he does not gain the armor's equipment bonus on Perception checks and cannot apply the armor's equipment bonus to his Fortitude Defense.