You can find a guide to the normal version of this encounter here!
Originally Posted by Aliena (10-man)Hello and welcome to the TankSpot Icecrown Citadel Raid Guide! My name is Aliena and in this video I'll cover everything you need to know about the heroic mode 10-man version of the Blood-Queen Lana'thel encounter. I will assume that you're familiar with the normal version of this encounter. If you're not, I suggest first watching our guide to the 10-man normal mode to learn about Lana'thel's base abilities.
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In her heroic version, Lana'thel sports 5 million more health than her normal counterpart, which puts her at around 19 million. Her enrage timer on the other hand does not change, so the DPS requirement of this fight greatly increases. We used a setup of 2 tanks, 3 healers and 5 DPS. You probably can't get away with less than 3 healers on this, I would not recommend trying.
Very little else changes for the majority of the raid group, though. Vampiric Bite inflicts slightly more damage when used and Delirious Slash now inflicts 75% of weapon damage and causes a 7000 damage dot instead of a 5000 damage dot on the tank.
The main change to this encounter is Presence of the Darkfallen. This is a stacking buff Lana'thel gains everytime a raid member gets turned into a vampyr. For each Vampyr present, her Shroud of Sorrow - that's the raid-wide pulse damage you take every 2 seconds - will inflict 5% more damage. In other words, the more the encounter progresses, the more damage the raid takes.
Coupled with Bloodbolt Whirl, this makes her airphases very menacing, particularly the second one. Depending on your raid setup, you may want to assign some cooldown rotations for this. What we did was to have our shaman fearwarded so he could put down a tremor totem to pulse as soon as Incite Terror hits, which minimized downtime for our healers. We also had two divine hymns available that we used on the bloodbolt whirls as well as one tranquility.
If you have fewer cooldowns available, I suggest saving them for the second bloodbolt whirl as that one is a lot more likely to kill raid members.
If you can deal with the increased raid damage while beating the enrage timer, Lana'thel should not pose a big problem for you as the rest of her mechanics stay exactly the same. Good luck!
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