First of all,we must know how to calculate the Dodge/Parry/Mastery on your character sheet

In order to calculate easily,i ignore the 2 factorsQuote:

Parry = 5%+ parry(after DR)

Dodge = 3.9% +dodge(after DR)

Block = 5%+15%(Sentinel)+Mastery*1.5%+0.44%(shield enchant)

DR math : 1/y = 1/c +k/x

x= Dodge/Parry Rating adds Dodge/Parry chance before DR

eg: Dodge rating 1384 of adds 7.84% Dodge chance,so x = 7.84

c=65.63 k=0.956

1 Hold the Line in the talent

2 ShieldBlock in the skill

Attachment 2513

some explanations for this table

it's easy to find thatQuote:

Parry = parry on your character sheet after add 176.72 parry rating

Before DR = increase 176.72 parry rating adds parry chance before DR

DR = increase 176.72 parry rating adds parry chance after DR

1%parry = the increase reduction when add 176.72 parry rating(1%parry =1reduction)

eg：the row of Parry = 15.58, 1%parry=0.75%

it's mean that 14.79%→15.58%,add 176.72 parry rating can take the 0.75% reduction

Mastery = mastery on your character sheet after add 179.28% mastery rating

Mitigation = the matery you had gain the reduction,In fact, it's a Mathematical expectation

math = block*(critBlock*0.6+(1-critBlock)*0.3)

1%Mastery =the increase reduction when add 179.28 mastery rating

1%Mastery(actual) = add 176.72 converse 0.9852 mastery' effect in actual

becase 176.72 = 1% Dodge/Parry(before DR) =0.9852 Mastery

Parry：13.23%→14.02% 1%Parry =0.79%

Mastery : in the same row 17→18 Mastery 1%mastery(actual)=0.77%

Parry：14.02%→14.79% 1%Parry =0.77%

Mastery : in the same row 18→19 Mastery 1%mastery(actual)=0.78%

so,it's mean when your character sheet

parry=14.79 mastery=19

Regardless add the points from gems or refoged

add the same points, the reduction from parry < mastery

however, when parry<15,mastery<19

you should choose the parry, because parry's reduction >mastery

Attachment 2514

from this picture ,wo can know the rate of change from this 2 attributes

X-axis is mean adding X% parry before DR

in the picture,the cross-point is close to 11(before DR)，so 5%+after DR(11) =14.59

At the last, for the easy to remember,the conclusion is that

note :Quote:

1.if your character sheet(buffed) Dodge/Parry<14/15 and Mastery<19,you should reforged or gems to Dodge/Parry is better than Mastery

It's gain the better reduction that maintaining the blance between Dodge and Parry as soon as possible

2.if your character sheet(buffed) Dodge/Parry>14/15 and Mastery>20 , stack the mastery util your unhittable =102.4%

parry14.59≈ 15 because 15 is more remmbered

dodge have the similar relationship when parry-1.1 ,so dodge =14http://www.tankspot.com/images/misc/pencil.png