Well, the way avoidance is added together is as follows:
Base %
+
Block or Deflection % x (1 - Base %)
+
Parry % x (1 - Base% - (Block or Deflection % x (1 - Base %)))
Basically.. you take the base (say, 40%). Then you add the percentage given from block or deflection on what remains (100% - 40% = 60%). So if you have 40% Deflection for example, you'd add 40% x 60% = 24%.
Then Parry is the remainder of all that (100% - 40% - 24% = 36%). So if you had 10% Parry, you are looking at adding 3.6%.
That's why 40% Base plus 40% Deflection plus 10% Parry comes out to 67.6% Avoidance, not 90%...
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