posted an interesting reply in the Tankadin thread, mentioning the increase in damage taken, because of Parries due to reckoning. Since I had some time on my hands, I decided to figure out increase in number of Parries.

There are two major subjective variables with this math: Avoidance and Weaponspeed. The first is important, because it dictates how often you get hit and therefore how often reckoning would Proc. The latter is important, because it's related to how many chances the boss has to parry and how many recokning charges get used. I have assumed, after looking around a few TC sites, that the chance to have an attack parried is 5% (I'm not confident about this number, if someone has some propper data, It'd be more than happy to change my equations).

For this, I'll be using my gears numbers. Against a level 73 boss, fully buffed, I have 45% avoidance, 55% block (after .6% has been removed from each due to the level difference). I'm also using [item]Continuum Blade[/item] which has a weaponspeed of 1.8s.

My avoidance gives me a 55% chance to take damage, and therefore a 5.5% chance for Reckoning to proc on each strike made by the boss. Most mobs have an attackspeed of 2.0s. This means, I'll have a reckoning proc, just over every 36s (2s/5.5%=36.36s). Since I'm using a relatively quick weapon, I'll use all 4 reckoning charges. Since there's a 5% chance to have an attack parried, I'll have one extra attack parried, on average, every 90seconds than if I didn't have Reckoning.

A general formula:

T is Time between Reckoning incudced Parries

A is Total Avoidance (Miss+Parry+Block, adjusted for a level 73mob)

W is your weapon's speed.

T=2/((100%-A)*10%)*20/(((W*4)-8)/W)

Important Note: if W<2, then assmue that (((W*4)-8)/W)=4

Just as a side note, this is pure therorycraft, and cannot be truely applied to any 'real' situation. It's merely insight into an ability, that we didn't have before. Also, I cannot give an actual damage increase value, as that relies upon how much the parry speeds up the attack (Yet to see any concrete numbers on this) and how much damage the boss actually does.