WAR and Wrath: Important Mechanics Discussed.

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Your entire premise is predicated upon the idea that the enmity generation increase from Defiance and Shield Oath is only enough to offset the reduction in damage dealt, which is not true. It may not be 2x like it used to be, but it is most definitely more than enough to offset the reduction in damage dealt. I know this because I've tanked while in Defiance and while outside of Defiance; I generate noticeably more enmity while in Defiance than while outside of it.

Um yeah sorry that's not enough. Some of us have actually tested this. You're gonna have to do better than anecdotes.

But then again this IS the person who tried to claim that Warrior cooldowns were as good as paladins due to "the superior uptime of bloodbath" so I don't expect much.

I wouldn't be surprised if it were actually a 2x multiplier still, because that would be a 36% increase in total enmity generation. A 75% increase in enmity generation is a 19.1% increase.

That's not how Defiance or Shield Oath ever worked. What they did is modify the enmity modifier of skills, meaning for example: Butcher's Block generated 10x damage as enmity instead of 5x. Any skill without an enmity modifier became 2x. This was 100% more enmity over not using defiance or shield oath, not "36%." You don't need an online calculator to figure that one out.

Assuming that defiance is currently is a flat percentage boost of 50% (it could be more or less, who knows? It's certainly not 2x, or even 1.5x, though), defiance and shield oath would be roughly an 11% enmity boost over not using defiance or shield oath - potentially less for Warriors due to how maim interacts with defiance. My anecdotal testing using the ingame enmity bars as indicators has shown defiance and no-defiance to be almost entirely equal to the naked eye. It wouldn't be a stretch to say that perhaps the bar has breaking points that don't communicate such a small boost very well, or perhaps the percentage mod is actually lower. Either way, anecdotes are anecdotes and yours don't mean any more than mine.

Even being anecdotal, if you had played beta you'd see a night and day difference between phase 3 and now.