This is one of the bigger changes (and one closest to my heart now that I'm tanking again) - Vengeance is gone in Warlords of Draenor, replaced with Resolve. Resolve is basically Vengeance minus the stacking buff to attack power, because of the way Vengeance interacted on certain fights. To put it into perspective, last night was my first night seriously tanking, and I was number four on total DPS - it would have been far higher had I not forgotten I was tanking for the first fight. At present, with Vengeance and tank AoE for purposes of picking up threat (plus, I admit, some fairly beefy Shield Slams once Vengeance stacks all the way up) you can see some ridiculous tank DPS, easily surpassing dedicated DPS players.
The solution being implemented here is to overall increase tank DPS without an unreliable mechanic like Vengeance adding different attack power depending on how much damage the tank takes. This also removes the temptation for tanks to deliberately take more damage in order to get Vengeance stacked up faster. So Vengeance is gone, and Resolve is implemented. How does it work?
- Resolve improves self-healing and absorbs done by the tank to the tank (so no, it won't buff priest bubbles) based on the damage taken (ignoring avoidance and mitigation, same as Vengeance now) within the last 10 seconds, and your Stamina. This means stuff like Death Strike, Shield Barrier, things of that nature. If you cast a heal on someone else, Resolve won't buff it.
- Each tank class' tanking mastery will now add 12% attack power, and the amount of attack power will scale with mastery as well. This is in addition to current affects, not replacing it - your tanking mastery will do what you're used to it doing, it'll just also do more.
- Brewmaster monks will no longer deal less damage. That 15% damage penalty? Gone.
The section of the patch notes detailing the change is, as always, behind the jump.