Defenses

Your Defenses represent your ability to avoid taking Damage and overcome attacks to the body and mind. You have three Defense Scores:
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Reflex Defense: 10 + Heroic Level or Armor Bonus + Dexterity Modifier + Class Bonus + Size Modifier
Your Reflex Defense (abbreviated Reflex) represents how hard you are to hit in combat, and most attacks target a creature's Reflex Defense. If an opponent's attack roll equals or exceeds your Reflex Defense, the attack hits.
Armor Bonus: Your Armor Bonus is determined by the Armor you wear. If you are wearing Armor, add your Armor Bonus to your Reflex Defense instead of your Heroic Level. This represents the difference between using your innate skill to avoid injury and counting on your Armor to absorb the damage from incoming attacks. If you are Flat-Footed or unaware of an attack, you lose your Dexterity bonus (but not a penalty) to your Reflex Defense. If you are Helpless (for example, knocked unconscious), calculate your Reflex Defense as if you had a Dexterity score of 0 (-5 modifier).
Size Modifiers:

• Huge → -2
• Large → -1
• Medium → +0
• Small → +1
• Tiny → +2

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Fortitude Defense: 10 + Heroic Level + Constitution Modifier + Class Bonus + Equipment Bonus
Your Fortitude Defense (abbreviated Fortitude) represents your ability to resist the effects of Poison, Disease, and Radiation, as well as your ability to ignore effects that would incapacitate a normal being. A nonliving target (that is, any target without a Constitution score, such as a Droid) instead adds its Strength Modifier to its Fortitude Defense.
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Will Defense: 10 + Heroic Level + Wisdom Modifier + Class Bonus
Your Will Defense (abbreviated Will) represents your willpower and your ability to resist certain Force Powers and other effects that attack your mind. When you are unconscious, you have an effective Wisdom score of 0 (-5 modifier).