The Eternal Palace
Abyssal Commander SivaraSingle Target
Nothing special dps wise on this fight, it's pretty much just a straightforward fight.
Use Anti-Magic Shell to avoid receiving any more stacks when taking damage.
Blackwater BehemothSingle Target
Radiance of AzsharaSingle Target
Make sure not to stand with the tank in the opener so you don't get parried in the start, other than that it’s pretty much a single target boss with a quick add Phase then back to boss with CDs.
Lady AshvaneSingle Target
If your Guild has enough DPS and you use Blood Lust on pull, just use Breath of Sindragosa like normal, if not, hold Breath of Sindragosa for each DPS window. Also make sure to have a Rime proc for Briny Bubble targets as well as having Remorseless Winter ready for this, if 2 people gets bubbled it is very good because you will get a free Rime proc if you have the Frozen Tempest Azerite trait.
Try to face yourself so that you hit the boss and the adds with Breath of Sindragosa, also make sure to use all you Rime procs on the adds. This can be done by having a quick focus macro which works wonders.
Use Death’s Advance to avoid getting knocked off in the Intermission.
Queen's CourtMulti Target
Make sure to cleave the Potent Sparks and boss when Breath of Sindragosa is up, make sure to have your Frost Fever on both bosses at all times. During Repeat Performance use Mind Freeze to avoid getting silenced but most of the time when Mind Freeze is down taking the silence is more worthwhile than spending a global on for example Death Grip.
Za’qulSingle Target / Cleave
If you delay your first Breath of Sindragosa by a couple of seconds you can have your Breath of Sindragosa for the majority of the first set of adds. Nothing special dps wise here if you are not going in to kill the add, normally you don't as a dk, but if you do - hold Breath of Sindragosa to easily kill the add. Always make sure that Rime procs are used on the adds. Always try to use Death Grip on adds which are far away, always use Remorseless Winter on 3 targets if you have the Frozen Tempest trait for free Rime procs.
Queen AzsharaSingle Target
Here you can either run with Frostwyrm’s Fury for AoE or Gathering Storm for extended Remorseless Winter for single target, it all depends on what your raid needs. Normally if you don't have a paladin to deal with adds in Phase 2 you have a Frost DK to do it with Frostwyrm’s Fury.
Use CDs instantly as you don't have much time with bosses being stacked in Phase 1, make sure that Frost Fever is on both bosses and try to save Chains of Ice for the hulk in Phase 1 to help out, unless it’s not needed.
For Phase 2 use Ashvane’s Razor Coral instantly on boss and never use it again until Phase 4. Save Breath of Sindragosa in Phase 2 until just before the adds spawn so you can help cleave them down with Breath of Sindragosa/Remorseless Winter and a Rime proc. If your job is to kill them, use Frostwyrm’s Fury here on adds and use Blood of the Enemy in both cases when adds come close to the middle and they are all in range.
In Phase 3 make sure to have Breath of Sindragosa ready for the add you are assigned to nuke, mine is normally the second add. What I do is when the first add is on 20% I go and LoS next to the console and charge my Azshara’s Font of Power while they move the Myrmidon over and then I start building Runic Power. When spear is being cast I instantly use Breath of Sindragosa, Rime proc, Chains of Ice and Frostwyrm’s Fury on the add. Then next Breath of Sindragosa is in Phase 4.
Right before last Phase, go and charge Azshara’s Font of Power when the boss is either at 51% or the add is about to die, then pop Breath of Sindragosa as soon as Phase 4 hits. Make sure to use your Anti-Magic Shell here to reset the stacks in order to maximize your uptime on the boss. Other than that in Phase 4 nothing special happens dps wise.
Use Anti-Magic Shell in Phase 2 to avoid being targeted by Arcane Bomb.
Use Anti-Magic Shell to reset your stacks in Phase 4.
Permafrost is very good seeing as your hp is lowered.
Crucible of Storms
The Restless CabalSingle Target
You can help out with interrupts with your ranged interrupt in Mind Freeze and your Pet Interrupt when it is transformed.
When it comes to how to use CDs on this boss, there is nothing special. You should use Breath and Dragon instantly in Phase 1 and when Phase 2 starts they will both be ready. Just make sure to wait until soaks are done before you use them, you could delay your dragon if you want to be full pma for the adds. In the instance that 1 add is higher than the others you can hard nuke it a little with Chains and Dragon but normally just use all CDs after you're done soaking as I'm not 100% sure if you can fit a 2nd set of 2 min CDs into Phase 2. Overall I think it comes down to how your raid DPS is, you really want everything ready for when Phase 3 starts.
If you use instantly in Phase 3 you can get 2 sets of 2 min CDs and Dragon. In Phase 3 make sure you don't kill anyone with Breath or Dragon during the mind control.
You can prevent stacks of Piercing Gaze of N'Zoth by walking through the beams with AMS. Your AMS will be ready for every second set of beams. You can soak multiple Oblivion Tears with Death's Advance and Anti-Magic Shell during usage of the Void Stone. If you get affected by torment in the last phase make sure to be full health before you have to go through beams without AMS. If you are in danger of dropping below 25% during Storm of Annihilation you can use Death Strike to heal yourself back up.
Battle of Dazar'alor
Champion of the LightSingle Target
Not much you can do here, either you fully nuke the boss or switch to adds at full energy then back to the boss. If your raid switches to adds you might get a second use of Breath of sindragosa, so keep that in mind when thinking about when you use your second potion.
Grong, the Jungle LordSingle Target
You should use your first breath of sindragosa on pull with bloodlust and your second should be used on adds seeing as you can hit both of them. When it comes to your dragon, if you use it on first set of adds it will be back up for the last set of adds right before the boss dies.
Jadefire MastersMulti Target
If your guild saves bloodlust for the first set of Multi-Sided Strike then save Breath of sindragosa for that moment (around 25 sec into the fight) and use your dragon on the adds/bomb. The most important part of this fight is knowing what the boss will do, such as jumping away and Multi-Sided Strike, having Bigwigs for this will make your life way easier.
OpulenceSingle Target / Cleave
In Phase 1 you should be able to pop breath of sindragosa 2 times unless one side is really lacking damage and your raid leader tells you to stop dps. The same can be applied to Dragon since it has a 3 min cooldown, be more careful when/if use the 2nd as you need it for 2nd set of adds in Phase 2.
Really when it comes down to it, Phase 1 is just about not placing something badly on the left side (Volatile Charge) and not dying on right side to the beam damage.
In Phase 2 you can only really get out 1 breath of sindragosa unless your raids dps is low, then you might get two uses.
Normally raids bloodlust on the 2nd set of adds so that's a good time to use Breath of sindragosa seeing as you can keep it way longer there for pure single. When it comes to your dragon, if you used 2 in Phase 1 your dragon should be ready again on the 2nd set if you popped only 1 in Phase 1 then consider using a dragon on the first set of adds in pillar of frost with 100% crit buff.
Conclave of the ChosenSingle Target
During the opener of this fight it's really important to use anti-magic shell to pre-immune the first hex, if you get hexed during breath of sindragosa then your entire opener is over. When you use your other cooldowns really depends on when your raid uses bloodlust and the boss’ kill time.
A great thing about Death Knight on this fight is you can Death Grip one of the raptors in and stun it for 4 sec so it can be cleaved. When doing this be careful after the stun to not be right next to it as it can fixate on you.
King RastakhanSingle Target / Cleave
Straight forward opener here using breath of sindragosa and dragon both in Phase 1.
When it comes to phase 2 and if you should use your 2nd breath look at the boss’ health before deciding. Sometimes your raid leader will tell you to stop dps seeing as the placement of death's doors is not complete and using your 2nd breath of sindragosa when you have to stop at some point anyway seems pointless. I would personally just wait until Phase 3 when adds are up and use breath and dragon on 4 targets and then again when the boss is low health.
High Tinker MekkatorqueSingle Target
Cooldown usage on this fight is probably the most simple, use them on pull and when it's ready again. Make sure to look at the wormhole generator time so you don't pop breath just before the boss flies away. Your 3rd breath will be during bloodlust in Phase 3.
A big thing for Death knights on this fight is being on Death Grip duty and trust me as a Frost Death Knight it's the worst, because on Breath of Sindragosa 1 and 3 you will have to run to the middle of the room and grip a robot. However, you can do this job really well and keep breath rolling, but it's not the easiest thing in the world so will take some practice.
Stormwall BlockadeSingle Target
On this fight as a melee it's pretty simple, in Phase 1 just drop pools (sea swell) on top of other pools, other than that nothing special.
In Phase 2 you pretty much just sit on the boss all fight and swap to adds if they are low and close to the boss and of course make sure you don't drop bad sea swells. Remember the boss has a very large hitbox which makes movement less of a dps loss for mechanics.
Use 1 Breath of sindragosa in Phase 1, save your 2nd breath for when phase 2 starts and for your last breath you either use it instantly off cooldown or save for bloodlust depending on what your raid does.
Lady Jaina ProudmooreSingle Target
Make sure you go full single target traits on this boss to maximize your Phase 3 damage and not overall.
In Phase 1 use Breath of sindragosa on pull and depending on your raid dps you might want to save your 2nd Breath for Phase 2. If the boss is around 67% and you got Breath of sindragosa ready then you want to save it, if its around 71% then you could use it. Only use 1 dragon Phase 1, in Phase 2 if you saved Breath, use it when you find a good time early on. For the second breath in Phase 2 it should either be saved for Phase 3 or used right before the Wall of Ice becomes active. I would recommend using it at around 32% boss health so you can keep Breath of sindragosa rolling for a few seconds on the Wall of Ice, seeing as Frost DK without CDs don't hit very hard.
Other than cooldown timings there is nothing very special about Phase 2, as a melee just stack with the group and single target the boss whilst you make sure not to bait the glacial ray in bad places.
Phase 3 is the most important part of the fight, as said above make sure you have the perfect traits for single target execute damage. If you did not pop breath on the Wall of Ice and dragon is ready you should use Breath of sindragosa as soon as you can as well as dragon. If you used your Breath they will be available around the time glacial ray will be cast, use them instantly if baits were good and also use dragon here.
Get a focus interrupt macro for the elemental if you are on Interrupt duty in last phase.
/cast [@focus]Mind Freeze