So I've been working on my tank monk for quite some time now. And I've come to the conclusion that no matter how much def you stack, at MP 8 and above, things like desecrator and arcane just can't be beat with raw defence.
So I've been working on taking it Mr. Miyagi style
"best way to block punch: no be there"
Normally, its best to move out of the way, but sometimes huge ammounts of enemies in the way really don't allow that.
So I've been trying a few lesser used skills for that.
Of course the first thing that popped into my mind was dashing strike. However I didn't really like it. It is way too hard to control and seems unreliable. It did the job of moving me out of the way, but never really let me choose where I wanted to go in a pinch, which often led to a quick demise.
Then I tried Lashing Tail Kick with Sweeping armada and scorpion sting. (I found sweeping armada most effective of the two). While this skill worked with careful planning, it didn't really get you out of danger quick enough since the skill didn't move you, so you remained stuck in the pools of death that are arcane and desecrator.
It essentially had the opposite problem of Dashing Strike. Lots of control, but no movement.
So I helped my friend power level on nightmare with TR and it occured to me: It gives you movement and control. I even discovered that there is a rune that deacreases damage you take as you are using it. Perfect for getting out of sticky AoE affixes like desecrator and Arcane. And since TR knocks back enemies, moving out of the way is never a problem. And because you move like normal when using TR, you have perfect control of where you go.
I found it to be incredibly helpful on high MP, but all I ever hear these days is how it only functions well on low MP.
Just my 2 cents on improving tank builds, and even offensive builds if you have problems with those types of affixes.