Quote Originally Posted by WowSuchName View Post
Current BIS:
Parry 621 ACC 480 Crit 356 DET 230 SPD 352
-Average Block mitigation = 6.79% (24.74% Block Rate with 27.45% MIT)
-Average Parry mitigation = 3.80% (25.12% Parry Rate with 15.14% MIT)
-Total Mitigation = 10.59%

Alternate BIS:
Parry 616 ACC 478 Crit 378 DET 219 SPD 352
-Average Block mitigation = 6.83% (34.72% Block Rate with 19.66% MIT)
-Average Parry mitigation = 3.79% (25.05% Parry Rate with 15.14% MIT)
-Total Mitigation = 10.62%

Basically, earn MIT0.03% + 22CRIT in exchange of 2ACC/11DET

So, for one, at full i90 your parry stops 24% per parry, not 15%. So, if you had a chance to parry all incoming attacks, it would actually be a little over 6% average mitigation.

Secondly, parry check is preformed AFTER block check, so increasing your block rate lowers the number of attacks you can parry. This means the onion shield actually lowers your total parry mitigation, which is pretty bad since your parry mitigates more than your block does with the onion shield equipped. (Again, 24% vs 20%.)

So, with Zenith/Allagan: You block 24.74%, leaving a little over 75% of attacks you could parry. Multiply by chance to parry, then amount parried, and poof: 4.36% damage parried. + 6.79% from shield, 11.15% total mitigation.

Onion: You block 34.72% of attacks, leaving 65.28% of attacks you could parry, all said: 3.94% damage parried. 10.75% total mitigation.

You lose 0.4% by switching to onion shield.