Block Changes and Diminishing Returns
I have done some testing on the MoP beta to look at diminishing returns on Block, here is what I have found so far on my 85 Warrior:
- Block on the Character sheet is currently bugged, when you first bring it up it shows non-DR values, doing just about anything changes the value to the DR values, for example changing stances or using Shield Block.
- Base chance to block for at least warriors seems to have changed from 5% to 3% or Bastion of Defense only adds 13% now instead of 15%, I have not tried unspecing and looking at base block, either way as a Prot Warrior base lock is now 18% down from 20%.
- The base 8 Mastery from specing Prot is effected by DR.
- Whitetooth's Avoidance DR formula works for Block DR with a Cap of 135.1. The formula is:
Block is based on Mastery so it turns out to be the following for Warriors:
Block DR = 1 / (1 / 135.1 + 0.956 / Block)
This is just Block from Mastery, to get the full Block you need to add the base 18% from above, the full Block for Warriors would be:
Block DR = 1 / (1 / 135.1 + 0.956 / (Mastery * 1.5))
Block = 3 + 15 + 1 / (1 / 135.1 + 0.956 / (Mastery * 1.5))
Currently on 4.3.3 I have 62.65% block without a range weapon because it will be gone in MoP, the bugged initial Character Sheet shows my block at 60.65% which is showing the lose of 2% base block. Once I get the sheet to update correctly or use the above formula my Block drops to 51.54%. About a 9% drop does not seem so bad, but remember Block is now a second roll so you can not compare the 51.54% to what we see in 4.3.3, this 51.54% is your chance to block for the second roll. To try to make it clearer, lets say I have 30% Avoidance (Miss + Dodge + Parry), which is probably on the high side (more on this later), this means I have 70% to be hit or block, the 51.54% * 70% is my chance to block which comes out to 36.08%. To sum it up it turns out to be 30% Avoidance, 36.08% to block, 33.92% to be hit, and I am CTC on 4.3.3.
We will have to see how things get tuned and it could be different at level 90 and based on the encounters but as it stand right now Mastery has dropped from very strong on live to weak, maybe even below hit and exp because we need to hit now to generate rage to use abilities like Shield Block and Shield Barrier.
I recommend reading Theck's blog on Blocking, he explains the new Block changes far better than I can.
I have not looked in to it much but Dodge on the beta has dropped in half for all the tanks, Druids are dropping from 40-50% to 25%, my warrior has dropped from around 15% to 7%. All I have noticed so far is naked I am at 0% dodge instead of the base 5% in 4.3.3. Parry seems about the same as 4.3.3.