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Expose Weakness  

Usable by  
Class  Hunter 
Properties  
Location  Survival, Tier 7 
Affects  Ranged Attacks 
Ranks  3 
Requirements  
Points required  30 in Survival 
Spec specific  Yes 
Talent required  Lightning Reflexes 
Related debuff  

Contents
[show] "Everyone has a weakness."
Expose Weakness is an ability from the Survival Talent Tree, which requires 30 Points in Survival and 5 Points in Lightning Reflexes, giving a 33%/66%/100% chance to Proc when you score a critical strike with your ranged attacks.
Assuming the hunter has 3/3 in the 'Exposed Weakness' talent, his ranged critical hits will have a 100% chance of proccing an Expose Weakness effect onto the target. the higher the agility, the better. Crit rating and agility is of the utmost importance to the Survival hunter. More crit = more proc > nearly never ending Expose Weakness.
Expose Weakness is is also available as set bonus of Dragonstalker Armor. The 8 piece set bonus of the Dragonstalker Armor gives you a chance whenever you deal ranged damage to apply an Expose Weakness effect to the target. The Dragonstalker Armor Expose Weakness proc increases the Ranged Attack Power of all attackers against that target by 450 for 7 sec.
Formulas
Given the following definitions:
E = Number of points in Expose Weakness
C = Crit Chance (for a 30.0% crit chance, use 0.30)
A = Agility
S = Attacks Per Second (for white damage only, this is 1/Attack Speed, or 0.5 for a 2.0 attack speed)
The following two formulas will provide information the statistical average amount of attack power provided by Expose Weakness, and the statistical average percentage of time the debuff will be up on the target.
Percentage of time Expose Weakness will be on the target = (1  ((1  (C * 0.33 * E)) ^ (7 * S)))
Average amount of Attack Power given by Expose Weakness over time = (1  ((1  (C * 0.33 * E)) ^ (7 * S))) * (0.25 * A)
By using these formulas, it is possible to figure out whether it is worthwhile to move from only one point in the talent to two, or even to a full three points.
Rank  % of Criticals  Time Up at 30% Crit and 1 attack/second  Time Up at 35% Crit and 1 attack/second  Time Up at 40% Crit and 1 attack/second  Time Up at 45% Crit and 1 attack/second  Time Up at 50% Crit and 1 attack/second 

1  33%  51.8%  57.6%  62.9%  67.5%  71.7% 
2  66%  78.7%  84.1%  88.3%  91.5%  93.9% 
3  100%  91.8%  95.1%  97.2%  98.5%  99.2% 
Notes
 At higher levels, this can be considered a flat AP increase, since you will crit least once in 7 seconds.
 This used to give 25% more AP for all raid members, but now is limited to hunter only.
