A few weeks ago, we ran the idea of having Zusterke (of PlusHeal fame) do a post outlining the actual math part of regen to answer all of your priesty questions. Thankfully, since the Snark Mavens do very little in the way of hardcore mathcraft, he said yes. This is the final part of his results.
Some Considerations for Holy Spirits

We’ve seen that the optimal ratio turns around 600 spirit for 1300 intellect. But we have also seen that we can easily take 200 spirit or intellect more and keep a fairly balanced score. This gives us some room to tailor our regen stats to our likings, without risking a severe penalty in our regen. So let us examine the factors that impact our balance:
- Lowered FSR: Some fights have phases and breaks in the healing. This can increase the value of spirit notably (say, 800 spi v 1400 int).
- Higher FSR: hard fights can be very demanding and rip away that chance on a regen break, decreasing the value of spirit and changing the ratio a few points in favor of intellect. But such fights also diminish your chance on a hymn of hope or it can make relying on Replenishment, shadowfiend etc more risky. In short: our balance favors more intellect but a healthy spirit basis becomes ever more important.
- Higher Crit: if you like a lot of crit, then you may score higher uptimes for holy concentration. This can easily up your HC time by 20% and really give spirit a push.
- Single target spam: if you spam a lot more single target heals, you will have more chance to proc holy concentration and up your spirit regen notably.
- Raid synergy: some raiding guilds really try to min max their raid groups. This means you really rely on some of your manabar based regen effects!
- Hymn of Hope + Shadowfiend: if you have the chance to use both together, do it! The 20% increase of your max mana effectively increases the performance of your shadowfiend by 20%. This tips the balance a bit in favor of intellect. But a fight that can allows such a break is likely to have a lowered FSR time.
- Shadowfiend + Bloodlust/Heroism: Bloodlust increases the haste of your fiend, giving more hits and thus more mana. This is a superb way to make your intellect count!
- Hymn of Hope + Replenishment: the increase of yout max mana increases the effect of your Replenishment. This favors stacking a bit more intellect.
- Spirit as backbone: when problems come your way, spirit will be your savior. When your group is sub optimal, your cooldowns got burned too early (or messed up!), or the guy providing replenishment bubble hearthstone’s out of Patchwerk, your intellect based regen drops like a stone. Intellect gives great synergy with the group, but that makes the group its lifelink. Having a healthy base of spirit can back you up under those odd circumstances.
There are probably a dozen more considerations that could manipulate the balance between intellect and spirit but I think I summed most of them here. Feel free to comment on more ideas!
Conclusion
It’s been a long post but I think we’ve reached some interesting conclusions for both the holy and discipline priest.
Discipline priests still gain the most out of intellect. In fact, it is unlikely that spirit will ever catch up with intellect as regen stat. Still, spirit beats mp5 for discipline priests with more than 1.1K intellect, which is definitely an eye opener for some!
Holy priests can still stack spirit and intellect with to a 6:13 or 8:13 ratio in favor of intellect and do just fine. Having more spirit will provide a great backbone in your regen model (and SP bonus!), but having more intellect will do great in min maxed raids. In fact, the optimal ratio has a couple of hundred points of leeway. With the current itemization in 3.1, I recommend going for intellect+spirit gear and gemming for intellect whenever you need more regen! I’m still a big fan of a healthy spirit basis, but intellect is definitely our biggest regen stat for now.
Whew! Y’all still there? Thank you all for your patience in this really awesome discussion. And again, huge thanks to Zusterke for putting it together for us. I hope this was helpful to all of you (I know I learned a lot!) And remember: if you’d like to continue discussion on this, consider heading to PlusHeal and opening it up to the community at large!

So, we need a minimum amount of spirit to support our intellect. This condition is very easy: for 1000 intellect, we only need 308 base spirit or 324 spirit unbuffed. It is fairly safe to assume a holy priest will have that amount of spirit and thus intellect beats mp5.
Round 1: Disc priest
Given 1065 intellect unbuffed, spirit can beat mp5 when raidbuffed. Starting raiders without sufficient intellect on their gear may find mp5 slightly more performant at first, but spirit will gradually outscale mp5 by the time they leave naxx 10m and the spellpower bonus from spirit makes the stat preferable quite early in the content.

Does this make sense? Like… any sense? It does! Basically this comparison tells us that we can stack a boatload of intellect before spirit catches up. For example, with 0 spirit, the optimal value for intellect is 2025! Well, intellect clearly wins this one!
Keep in mind that these are basestats and thus spirit should be a tad higher. Still, it’s quite clear that spirit has lost some considerable ground to intellect! That is, for 20% HC Uptime, 90% FSR and no specific synergy with your manabar regen abilities. Do check that other ratio’s, with some more spirit or some intellect also score quite well as optimal (less than 10% difference).
The regeneration model of WoW has seen a lot of changes with patch 3.1: spirit/intellect regeneration was nerfed outside the five second rule, the shadowfiend is buffed,
Having checked dozens of WWS parses, it seems Replenishment ticks 75-95% of the time (see screenie). I consider 85% an average which yields me: 85%*1.25% = 1.0625% of my manabar as mana every five seconds.
We can calculate the percentage of maximum mana per 5 seconds we get for both Disc and Holy priest. We can use that percent to calculate how much mp5 per point of intellect we get from manabar based regen but here we must take into account the bonus on intellect accordingly: 

These values probably like an odd mix of Thalassian and Chinese so let’s simplify them. We assume 90% time spent inside the five second rule and for holy priests we add 20% Holy Concentration uptime (see image). This is a bit pessimistic but it’s better to play safe. Holy priests tend to have a notably higher mana consumption when raidhealing and most raidhealing spells do not trigger holy concentration.
Taking into account buffs from talents and 

When I first heard about Dual Specialization, my first thought was: Yay, finally!
Gearing for Discipline
Let’s talk about Discipline. After all, everyone’s doing it these days. With the advent of WotLK, Discipline has risen in popularity and utility for PVE content. I don’t have to tell you how awesome it is, because you can’t sling a wet cat (not that I advocate aqueous feline bombardment) without hitting a dozen blog or forum posts about how awesome Discipline is. Some enterprising soul even registered
Everyone is entitled to their opinion. I’ve repeated that to myself a lot in the last few weeks… a mantra of sorts.
The popularity of Divine Spirit rises and falls, but most raid groups agree it is a Good Thing To Have™ even if Spirit isn’t quite the Holy Grail it used to be for certain healing classes/specs. I remember, with wry fondness, the days when a Priest had to fall on their (buddy’s) sword and spec Hybrid to provide the raid with Divine Spirit. 23/38 wasn’t a very fun spec to play for most of us, but we did it when we drew the short straw for the betterment of the group.
It’s that time again, kids. What time, you say? Time for another peek into the World of Snarkcraft Mailbag! I know you’re excited, but try to pace yourself… this is just the first of many Mailbag entries to come for 2009!
In Which Jov Eats Crow
Intellect is a Regen Stat
Intellect vs Spirit

