Originally Posted by
Peacekeeper Benhir
Hard to say if you're pulling too much without being there. Are you holding agro on everything you pull? Are you dying? Is your healer struggling to keep others alive because you require all of their attention? There aren't any hard and fast rule about how much to pull; it's all about what makes for the smoothest run.
At higher levels it's less about spamming anything and more about knowing when to use what. You won't be able to have Shield of the Righteous up 100% of the time, so you make sure you have a charge ready for when you're about to get hit hard. You use other defensives (Eye of Tyr, Ardent Defender, trinkets, etc.) to fill in between charges of SotR.
Defensives do stack, but they stack multiplicatively rather than additively. This makes it better to rotate them one at a time unless you're expecting something really nasty (Cenarius or Odyn's spears, for example).
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I'd recommend this video for all aspiring tanks:
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And here's another he's done more recently: