Defiance only increases healing by 20%, and that increase doesn't work on abilities like Lustrate, Tetragrammaton and Essential Dignity.
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I covered this back on the first page, EHP is even, E healing WAR gets slightly less from spells (4%) and significantly less from abilities.
As a side note this is typically used as a central argument for justifying WARs current state whilst simultaneously requesting a fix. Which would you rather have?
WAR healing with Tetra, Lustrate, and Essential Dignity isn't really a problem of their class, but how SE has chosen to categorize them. It leads to problems with more than just Defiance, because while Cure/Physick/Benefic/Medica/Helios, etc., are all healing magic, Tetra/Lustrate/ED/Benediction are "abilities". I'm not sure if that is how they intended them to work, but it's been a big concern for healers because they are also unaffected by things like Fey Illumination.
I don't have a link either, but I remember reading this was by design *but* it was something the devs were monitoring and open to changing.
All of the disagree.
Shadow Wall is a weaker cooldown because DRK has other tools in its kit that make up for it. Dark Mind comes to mind first which is essentially a 2nd, magic-only Shadow Wall with 1/3rd of the recast time and equal duration. Dark Dance has the same crazy-short recast and in addition to the physical mitigation, helps proc Reprisal which not only adds another 10% mitigation, but does so for the entire raid.
When you look at the power of its other cooldowns and realize that none of them are useless in a raid setting and synergize extremely well together, its clear why they didn't make Shadow Wall as strong as Sentinel/Vengeance. It doesn't need to be.
Just make it 40%. Who cares? It will make nearly no difference when it comes to what DRK can and can't survive in real situations.
Putting it at 2 minutes, however, would. So don't do that.
Its surviving just fine with plenty of HP to spare all the way to A4S without it being 40%. Reprisal and DA Dark Mind make up the difference. There are countless other things squeenix needs to fix first. Taking the entire toolkit of all 3 tanks into account, they're very much on equal footing overall in terms of mitigation.