Analysis, Lunar Guidance, Spells and Talents
Excited about the upcoming changes to Regrowth‘s mana cost, I have been working on a comparative analysis of Regrowth‘s HPM value to that of Lifebloom. Part of any analysis of this nature is factoring in the +Healing coefficient for each spell — no small task when you consider the number of talents that can affect your final numbers! Usually, I’ll check WoWWiki to look for the relevant numbers. When I pulled up the numbers for Regrowth, however, I noticed something odd: WoWWiki lists the +Healing coefficient for the direct heal of Regrowth as 16.6%. That’s really low, even for a spell that takes 2.0 seconds to cast and even considering that the spell includes a HoT component with a coefficient of its own. It also didn’t seem consistent with the numbers I experience when using Regrowth. So I loaded up the game and tried it out for myself. I discovered a coefficient of 0.4582. I’m going to describe how I performed these tests in the hopes that some readers can do the same and let me know what results they get.
Because the direct heal component of Regrowth exists as a range of numbers, it’s more difficult to determine its coefficient than for something simple like a HoT tick or the bloom of Lifebloom. Therefore, I cast Regrowth on myself about 100 times to find a maximum, non-crit value of 2140 and minimum of 1989. These numbers were generated at 1617 +Healing. I don’t have 5/5 Improved Regrowth which made testing easier since I didn’t have to worry as much about critical heals (I excluded the few that did crit). If you decide to perform this test on your own (and I hope that you will), you should disregard any critical heals that you get; we can factor the crit rating and bonus in later. For the sake of clarity, I performed my calculations with Gift of Nature (+10% to all heals) and Empowered Rejuvenation (+20% to +Healing effects on Heals over Time), two talents that most non-Dreamstate, healing Druids are likely to have.
The formula to determine the healing coefficient of a spell is:
(Coefficient * +Healing) + Base Heal = Avg. Amt. Healed with +Healing
So plugging my numbers into this equation and solving for the coefficient, I get the following:
(Coefficient * 1617) + 1325.5 = 2064.5
1617 * Coefficient = 2064.5 – 1325.5
Coefficient = (2064.5 – 1325.5) / 1617 = 0.4582
That’s a pretty substantial difference and means that Regrowth will scale far better than the number on WoWWiki indicates. This calculation doesn’t account for spell crit, either the ~10% most of us will have due to Intellect or the 50% + ~10% a Druid with Improved Regrowth will have. To find those values, we adjust our formula like this:
(Coefficient * +Healing) + (Base Heal * (1 + (0.5 * Crit%))) = Avg. Amt Healed with +Healing * 1 + (0.5 * Crit%)
Therefore, the coefficient when factoring in these two crit ratings would be:
Coefficient10% crit = (2167.725 – 1391.775) / 1617 = 0.4799
Coefficient60% crit = (2683.85 – 1723.15) / 1617 = 0.5941
So my question to you is this: am I crazy? Where is this 16.6% coefficient coming from? Oddly enough, the coefficient listed for the HoT portion of Regrowth (1.194) only matched the number I found (0.9227) if I assumed 2-piece T5 set bonus, a bonus that extends the life of your Regrowth HoT by 2 ticks (a stipulation not specified by the author) and would cause me to multiply the coefficient by 9/7.
And for those curious, my numbers for Lifebloom differed from those on WoWWiki, though less than my numbers for Regrowth:
|I Found||WoWWiki Lists|
* I tested the "Lifebloom, Direct" figure on the PTR since it will change in 2.4. Therefore, I am not listing the comparison from WoWWiki. If you decide to do any testing for Lifebloom, be sure you don’t have any Lifebloom-affecting idols equipped.
I would really love to hear some feedback from the rest of you if you have the opportunity to do any testing on your own!
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