
Originally Posted by
holland11
okay thank you ossix this makes a lot more sense to me. so what your saying is i should look at the different ways i could gem my gear with def vs parry vs dodge and see which way i could get the most avoidance out of it.
Yes. You should never gem for parry because it suffers from significantly higher diminishing returns than defense and dodge, so it becomes a question of whether defense or dodge gives you more avoidance at any given time. The optimal balance of defense:dodge is somewhere between 3:2 and 2:1.
Satrina's article on diminishing returns is a great read if you're looking to understand the math behind it.

Originally Posted by
holland11
so then what is your take on the stam gems vs def/parry/dodge, and also the couple AP/str gems i have atm?
On the AP/Strength gems:If you choose to gem for threat, you'll want to gem for hit to the cap for yellow strikes (5%) and expertise to push parry off the boss's hit table. Hit to the cap for yellow strikes is important because eliminating misses from Shield Slam/Revenge/Devastate will do more for your threat than some extra AP or Strength. With raid buffs and debuffs on the boss, this should be very easy, and you might already be at 5% without having to gem for it.
I'm having trouble finding the exact number for getting expertise to the parry cap, but the basic idea is that when a boss parries your attack, its next attack on you comes more quickly. So gemming expertise to the parry cap makes more of your attacks hit, and eliminates the possibility of you taking burst damage from the boss because he parries you.
Beyond this, Strength is more effective than AP for warriors and paladins (I think) because it increases block value. I'm not sure which is better for druids and DKs. That said, you will never see me with a Strength gem in a taking set. Why? Because when I want to increase my threat at the cost of survivability, I can respec and pick up a few DPS talents to reach the same goal.
As for the issue of whether to gem and enchant for Effective Health (Stamina and Armor) or Avoidance (Defense/Dodge/Parry), that's a debate that's been going on for quite some time. Personally, I fall into the Avoidance camp, and will almost always gem for Defense and Dodge. There are other intelligent tanks out there who will drop Stamina gems into every slot they get.
If you want to understand the debate, I'd encourage you to read two articles. First, read Ciderhelm's first post in Ciderhelm - Effective Health Theory. Second, read Wanderlei - On Avoidance. Both of these articles are over a year old and contain references to dated mechanics such as crushing blows and spammable Shield Block, but the main arguments in each are still strong. Personally, I find Wanderlei's arguments to be more persuasive.
To be clear, Effective Health is still very important for an Avoidance tank, and vice-versa. Even though I find stacking Avoidance to be more effective, I would still use the 3% Avoidance / +2% increase in Stamina runeforge above the 4% Avoidance runeforge.
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