I’d hope you’ve seen this thread on maintankadin, it’s been fairly regularly mentioned around the blogosphere and twitter.
Theck has worked out a new formula for effective health which accounts for magic or non-physical damage. This is significant because the usual EH formula assumes just physical damage and armour, basically, whereas the New EH accounts for magic, bleeds and resistances.
At the time of writing this, artifact 19 (in the Conclusion) is the formula:
(1-X-Y) X Y EH = H*D/d = H*-------------- + H*-------- + H*-------------- (19) (1-Ma)(1-Mt) (1-Mt) (1-Mg)(1-Mr)
He’s said that:
The take-home message of these formulas is that armor loses effectiveness linearly with the percentage of “regular” physical damage intake for a given fight.
In other words, for a fight with only 50% non-bleed physical damage, armor is reduced in effectiveness by 50%. If an armor trinket is worth 100 stamina on a purely “regular” physical fight, it will only be worth 60 stamina on a fight with 15% bleed damage and 25% magic damage (60% “regular” physical).
I asked Theck to confirm how we’d use this to compare Unholy talents for damage reduction (which is 6% on all magic damage) to Frost’s 2% flat reduction on all damage plus 3% melee avoidance. He answered (page 3, about half-way down):
“The easiest thing to do is to just take the EH equation, choose a particular fight (i.e. X and Y), and plug in your health H and armor A, along with the mitigation factors Mt, Mg, and Mr.
For the 2% flat damage mitigation talent, add 0.02 to Mt and Mg before calculating.
For the 6% magic reduction talent, add 0.06 to Mg before calculating.”
I haven’t done that EH calculation yet.
The result would be you could work out the EH of a Frost and Unholy tank, if all gear was otherwise the same (ie. just the talent differences), as they’d be in different fight-types, say one with 10% magic damage and another with 20%.
Any fellow geeks want to, go ahead, it’s pretty easy: just stick it into Excel if you’ve no maths tools. Let us know here.
Wrathy is going to start tabulating the different damage mixes in ToC and ICC, which means the New EH can then be used to help select gear and talents by applying the formula, to in turn improve survival in the new ICC content.