And the guides/tips for healing Ulduar as a Holy Paladin continue. You can find the first two ones here:
Healing Ulduar - Flame Leviathan & Razorscale
Healing Ulduar - Ignis The Furnace Master
And as a reminder, I also wrote some more general articles about healing in Ulduar before:
Ulduar paladin healing guides
Ulduar Paladin Healing Tips (update)
Today I'll talk about ...
You can find details about the boss on its Wowhead page, I won't detail strategies here and only focus on the healer role in this fight.
There are 2 small groups of trash mobs that were put back into the instance after the first two weeks (they were buggy at first). You can find them on the left and right side of the boss courtyard, take care to not pull the boss before having dealt with them (you will see the boss but not the trash mobs when you approach).
Now about XT, the first thing you should know is that he has been severely nerfed since the first weeks of live. The biggest nerf being his Tympanic Tantrum.The version on wowhead on this day is still the old one, when it was inflicting damage equal to 120% of their life to each raid member. You can easily guess that, if raiders were not healed, they will die. Combine that to the potential simultaneous Searing Lights and Gravity Bombs and you had regular deaths during the Tantrums. Now damage was reduced to 80% total life, which means that, if there is no external damage, none will die from a Tantrum. Light/Dark bombs can still be deadly, but it will be much easier to cope with the amount of damage today, this is why most raiders have found as the biggest nerf to XT. He's the one guarding the entrance to the core of Ulduar, and Blizzard wanted to be sure most guilds could go there.
Now that I've ranted a bit about the nerf of XT, and that I've pointed its biggest threat for healers, let see how the fight goes.
You will have 2 tanks, one main tank on XT, and one off-tank for the biggest adds that will not be dpsed. The stress on the off-tank will grow with time, having only one add is a joke, having 4 starts to be much more healing stress, he should keep his cooldowns for the end of the fight, to help with healing.
The main aspect of the fight is its two phases. Each 25% of his life, XT enters phase 2 when he goes inactive and exposes his heart. Phase 2 is also when adds pop. The main aspect is that this is a relatively low damage phase (compared to boss + Tantrums + light/dark bombs). You will be able to use cooldowns like Divine Plea without any risk during that phase, and you should regain a large amount of mana in 30s (Phase 2 lasts for 30s whatever happens, unless you break XT heart but I won't talk about the hard mode).
The MT will take heavy damage, be ready to toss some big heals from time to time, and don't worry too much about your mana if you're the MT healer. You'll have time to get some mana back during phases 2. As always, keep your Sacred Shield up on the main tank, keep your Judgement on XT (Light or Wisdom).
After a phase 2, take care when XT resumes damage on the MT, as you were probably helping with bombs damage or even dpsing (yes, dpsing :p) during phase 2.
If you are healing the off-tank, don't get lazy during the first or even second add phase, he will only have one or two adds and that could seem easy, phase 3 will be harder, and if you are in 25-Man, you'll even need 2 off-tanks as 2 big robots pop each add-phase.
Now, depending on the other healers of your raid, you could need to help during the tantrums (even if you know it was nerfed hard :p). Then simply put your Beacon on your healing target (MT/OT) and raid heal, the usual. If you're healign the MT pay attention though, damage spikes can happen.
Usually I keep my Beacon of Light on me during that fight, so that I don't have to heal me during tantrums, or on a Light/Dark bomb. I can keep a regular and steady healing stream on the main tank and I'm fealing much more secure on his survival that way.
Have fun, next week Kologarn and the Iron Council (that some people are calling the Assembly of Iron, how weird).