Critical hits can be treated as a final multiplier of (1+critrate) on damage:
Code:
Where c=critrate and d=damage, the expected value of damage is:
2cd + (1-c)d
2cd + (d - cd)
cd + d
d(1+c)
So the 2% crit/slvl adds a multiplier of (1+.02 * slvl) to damage. Not bad! The ED% (25% + 5%/slvl) is also multiplicative, so we have two multipliers applied by Mastery:
Code:
(.05s + 1.25)(.02s + 1)
.001s^2 + .075s + 1.25
An exponent - how exciting!
Punching in values of s, we get...
Code:
1 1.326
5 1.65
10 2.1
15 2.6
20 3.15
25 3.75
The .001 coefficient on the s^2 keeps it from getting
too exciting, regrettably
Subtract .02 from each of these multipliers for Mace/Sword/Axe Masteries - I'll never understand the discrepancy.