BRING BACK FROST DK DUAL-WIELD TANKING.
Or warlocks, since they have the general structure in place already.
Also, D&D and Consecration are tanking AoE staples. You know what other spell currently functions just like these spells that is going virtually unused? EARTHQUAKE! Another perfect earth-based tanking spell for shaman. I can ramble on about this endlessly.
Shaman is a big no, shamans already have enough as it is, a ranged and melee dps spec and a heal spec.
Giving them a tanking spec would not only be greedy but downright deny other classes the chance.
To be honest, give warlock demonology spec a rehash to be a tanking spec (metamorphosis practically is, anyway).
Shamans don't "need" a tanking spec, nor would it make any sense to have one.
Also, Druids have ranged, healing, melee, and tanking specs. How does it deny other classes the same ability?
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I don't think any class should have a 4th spec... including druids. I have a feral druid btw. I liked the days when as a feral you could effectively choose dps vs tank by talents, rather than having an entirely different spec.
I would completely switch to my shaman if there was a 4th tanking spec, I love tanking with my pally and monk, and I love healing and dps with my shaman, so a tanking spec would be perfect, I can even make a new shaman to play all specs !
The tanking role isn't just a position of servitude. It's also a position of power, both literal in terms of what gets pulled when, and metaphorical in terms of the implications that the tank alone among the party members is the one physically powerful enough to survive incoming damage. This is why Death Knights work as tanks thematically, and it's why rogues and warlocks would too.
Tanking is, first and foremost, taking the damage instead of letting other people take it. Taking damage hurts a lot. So I see a tank as someone who values the lives of other people more than their own life. And sure, with that servile position also comes some power. But again, it hurts. It's an act of self-sacrifice. That's why I can't see a Rogue or Warlock wanting to take that role.
The warlock overreaches in order to gain direct power, and risks her own safety for personal gain.
A warlock would be much more likely to injure herself in order to empower a mind-control spell to let someone else be beaten up than to step forward herself.
This is a pretty great post summarizing the potential that already exists within current shaman abilities.
Just need a tree, crit reduction, and a mastery!