In every twenty-five-man raid, you’ll have more than one member of a class along for the ride; there are only ten classes after all. In most raids, you’ll also find multiple members of the same talent tree: three arcane mages, two affliction warlocks, and a partridge in a pear tree. The plus-side of having two or more of a class in a raid can include taking turns using reagents, multiple mage-tables and summoning-stones, and extra battle rezzes.
While some buffs don’t stack (more than one Tree Druid doesn’t mean more than one Tree of Life Aura, for example), all heals do; and in general, when you bring lots of healers to a raid, the only noticeable downside is overhealing. Two Resto Druids can roll Lifeblooms on the same target; two Holy Paladins can Flash Heal the same target. However, a Discipline Priest is designed not so much to heal damage as to mitigate damage, and while heals stack, these mitigation tools do not. Multiple Disc Priests are therefore not ideal. (Not ideal. Ha. That’s me being restrained. Multiple Disc Priests fucking sucks. There. I said it.)
- Grace does not stack.
- Divine Aegis does not stack (although 3.1 will allow one priest to stack DA up to 125*level of the target; I doubt that DAs from multiple priests will stack)
- Power Word: Shield does not stack.
Of course, not everyone is going to min-max their raid composition, and sometimes — ideal or not — you will find yourself in a raid with more than one Disc Priest. If respeccing to Holy isn’t an option for someone, then take these things into consideration:
1) Who has more spellpower?
The Disc Priest with the largest spellpower will have the biggest heals (duh), but will also provide the largest shields. (Borrowed Time increases the absorption of PW:S by 8% of your spellpower). I have been asked by other Disc Priests “What’s your crit?” when trying to elbow me out of the tank-healing and into the raid-healing role. But the important factor isn’t simply who crits more frequently — well, unless you’re comparing a healer with 10% crit and and one with 30% crit — but the impact those crits will have. Although crit is desirable for Disc Priests as it procs Divine Aegis, crit is also desirable because it results in a 150% larger heal. Regardless, crit is a percentage based chance; more spellpower provides more and more consistent throughput.
Hypothetical Situation is Hypothetical, with Math
Disc Priest 1 has a 30% crit rating and 2000 spellpower
Disc Priest 2 has a 20% crit rating and 2200 spellpower
They both hit Prayer of Mending twice, and all five charges results in heals. With ten “heals,” Disc Priest 1 will crit 3 times and Disc Priest 2 will crit twice. Assuming none of this is overheal (and remember, Divine Aegis will proc upon any crit, but it only absorbs based on the amount healed), Disc Priest 1 will place three bubbles on targets. Disc Priest 2 will place two.
Disc Priest 1 has healed for 30544 and absorbed 1032 damage. Total: 31576
Disc Priest 2 has healed for 30986 and absorbed 846 damage. Total: 31832
Spellpower > Crit.
Of course, what you do with this knowledge and how you choose to assign multiple Disc Priests will likely be affected by the composition of the rest of the healer team. If they’re all shamans, then two Disc Priests can heal the tanks. If they’re all paladins, then make the healadins raid heal, the OP fuckers. Regardless: make sure you’re clear about heal and shield targets. Do not shield someone else’s target(s).
2) Who has buffs and debuffs?
Broken record: I’m a huge fan of Grid as it can be setup to monitor any buff and debuff on the raid. Regardless of whether your fellow priests are Disc or not, it is worth using Grid to track the Weakened Soul debuff (You can add it under the Auras tab). I show Weakened Soul as an icon in the center of the raid frame so it is clear who is ineligible for a PW:S. Grid can also be used to monitor your other buffs and procs: Power Infusion, Pain Suppression, Grace, and Divine Aegis.
3) Who has which glyphs?
Three Discipline Priests walk into a bar. One has PW:S, Flash Heal, and Holy Nova glyphed. One has PW:S, Flash Heal, and Prayer of Healing glyphed. One has Smite, Fade, and Mind Control glyphed. Priest 2 might be better suited in a melee group for group heals. Priest 1 might be better suited in a caster group for group heals. Priest 3 gets to wait outside at the Naxx summoning stone and MC flagged players off the edge.
4) Who has Focused Will and Martyrdom talented?
/smack. This person gets to go respec Holy told the raid is full.
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