
Originally Posted by
PiedPiper
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.