Subtlety Rogue raid bosses guide

Patch 9.2.5 Last Updated: 6th Aug, 2022
Pushnoir Subtlety Rogue Author
Pushnoir

Raid Bosses

Sepulcher of the First Ones

Vigilant Guardian

Single Target, AoE and Funnel
15
25
30
35
40
45
50

Legendary:

Venthyr: Unity + Finality

Kyrian: Unity + Akaari’s Soul Fragment

Notes:

As usual, the first boss of the raid is a simple fight mechanically. You just have to avoid standing in the “bad stuff.”

Your covenant choice for this fight will typically be Venthyr, and you will optimize for AoE/funnel. You don’t really want to funnel that much because the adds have to die, so you can just AoE everything down.

The end of the fight is pure ST, which means Kyrian could be an option if you are lacking during that part of the fight.

You can use Door of Shadows when getting Matter Dissolution (it’s a debuff that spawns a bunch of orbs around you when it drops) and use Door to get out of the circle of orbs quickly.

Use Cloak of Shadows freely. It doesn’t really matter where you use it for the fight's mechanics. Basically, just use it to get higher uptime on the boss.

Skolex

Single Target
15
25
30
35
40
45
50

Legendary:

Venthyr: Unity + Akaari’s Soul Fragment

Kyrian: Unity + Akaari’s Soul Fragment

Notes:

Skolex has this nasty debuff that slows your haste by 33% and stacking, but you can completely avoid this by just dodging the blue pools that spawn around melee. Note that you can run over pools that have already spawned on the ground without getting the haste debuff; however, you will take some damage. You can also use Cloak of Shadows to remove the debuff if you soak one of the blue pools.

You will lose some uptime on this fight; it's inevitable. You can, however, reduce the amount of lost uptime by being clever with your Shadowsteps. You basically want to use Shadowstep on a ranged player in the stack group once you've seen that everyone is close to the stacking point. It's only a matter of seconds, but we take those if possible.

Apart from that, this fight is just a single target DPS check, and you might want to hold some CDs before going into the stacking, but it entirely depends on your strategy.

Artificer Xy'mox

Single Target, AoE and Funnel
15
25
30
35
40
45
50

Legendary:

Venthyr: Unity + Finality or Akaari’s Soul Fragment

Kyrian: UnityAkaari’s Soul Fragment

Talents:

Shuriken Tornado: if Venthyr and doing platform) / Master of Shadows: if you play as a Kyrian and you are just hitting Xy’mox.

Note:

For Xy’mox, you want to choose your covenant based on the strategy your guild is playing and if you’re in the “portal groups” or not (the ones jumping to a new platform). You play Venthyr if you’re in a portal group, and you play Kyrian if you are just meant to single target the boss the entire fight.

Cloak can be used for uptime during the rings, especially at the very end of the fight. You will move a long distance with the portals, which means the boss might take a while to reach you again, cloaking this is a decent choice.

Depending on your raid composition, you can either AoE or funnel into the Acolytes during the intermissions. You can use feint on quite a lot of things on Xy’mox, one example being the tank explosion. It’s perfectly fine to be close to the tank and boss if you just feint it.

It’s not worth using Cloak for the traps since they respawn anyway.

Dausegne

Single Target
15
25
30
35
40
45
50

Legendary:

Venthyr: Unity + Akaari’s Soul Fragment

Kyrian: Unity + Akaari’s Soul Fragment

Notes:

Dausegne is a single target and occasional 2 target cleave fight with a decent amount of movement required.

Shadowstep tips: This is just my way of handling the halo circles in this fight.

Use Shadowstep on Dausegne or the add when it’s up, and it’s within a halo. I tried to Step a friend for a while, but eventually, I gave that up and instead used shadowstep on the boss at the last second before the halo reached me.

This pretty much means you have no downtime, and you’re dodging the halo’s.

Another thing you can do is to use Cloak on an early halo to keep uptime during cooldowns and then Step the rest until you have Cloak again and save it for the 3 halo-ring overlap.

As for cooldowns, you don’t have to hold anything for the shield. Healers can deal with it, and you can just use all your cooldowns when they are ready for maximum DPS.

Prototype Pantheon

Cleave & AoE
15
25
30
35
40
45
50

Legendary:

Venthyr: Unity + Finality

Kyrian: Unity + Akaari’s Soul Fragment

Notes:

This is a Venthyr + Finality fight. You can play Kyrian as well, it will be slightly better in P1 and P2, but those phases are more or less irrelevant.

Prototype Pantheon is a fight that might seem like an assassination fight. It has 2 target cleave, which is notoriously bad for subtlety. It has 4 target AoE, which typically isn’t a favored target number for us. But with the Soulblade 4p, we gain a lot of DPS on 4 targets. But the biggest reason to play subtlety on this fight is the ease of use. Subtlety is just spamming 2 abilities on 4 targets, while assassination has to maintain bleeds on 4t while getting the full value out of their exsanguinated vendetta.

While the information above is still true, in regards to assassination. As of 9.2.5 and the buffs to outlaw, it’s safe to say that outlaw is just superior on this fight from now on.

Prototype Pantheon is basically all about the last phase when all 4 bosses are active. Subtlety has one niche mission it can do in this fight: single target down Ritualist adds in the last phase. With frequent short CDs, you can easily swap to these adds without losing much because you have 2 Shadowsteps and Door of Shadows to quickly move between boss and the adds.

Cloak can be used to stack inside the Hand of Destruction, which gives more space to others while also avoiding the damage.

Lihuvim

Single Target & AoE
15
25
30
35
40
45
50

Legendary:

Venthyr: Unity + Akaari’s Soul Fragment

Kyrian: Unity + Akaari’s Soul Fragment

Talents:

Master of Shadows or Shuriken Tornado if you are playing as Venthyr and you need AoE damage.

Notes:

Straight forward fight for subtlety. Use all cooldowns on cooldown. You will do less damage to the first Protoform Schematic, so make sure your raid knows that they might need to use more cooldowns on that.

Tell your raid leader to make a strategy where melee can hit the boss while dropping the motes. It's easily doable if you spend some time setting it up.

During the 2nd intermission, you will have a big Defense Matrix add and a bunch of smaller Degeneration Automa. I would suggest to just AoE spam during this while having the Defense Matrix as your primary target (procing Sylvanas dagger damage on it). There is a case to make for funnel on this big add, but usually, you want to start killing the Degeneration Automa as soon as possible.

Apart from that, it's a pretty easy fight. I was the leader of my Harmonize group, so I couldn't really utilize the Shadowstep tech in this fight. But you can easily make a Shadowstep macro for your Harmonize group leader and Step that person when you have to stack up after a knockback or pull.

Use Cloak to avoid damage in any part of the fight. It doesn't really have a function apart from reducing damage taken.

Trinkets: Chains of Domination and Cache of Acquired Treasures are both excellent trinkets for this fight. Use either on pull and it will line up perfectly for the big aoe of the fight

Anduin Wrynn

Single Target / Funnel
15
25
30
35
40
45
50

Legendary:

Venthyr: Unity + Finality

Talents:

The regular single target build but you swap in Shuriken Tornado instead of Master of Shadows as most of your damage will come from multiple different funnel moments in the fight. Prey on the Weak is actually an impactful talent on this fight, should be taken over the 30% slow or free Cheap Shot.

Notes:

This is a fight where your guilds strategy will impact some of your gameplay decisions:

  • Do you need to funnel or aoe the Lost Soul adds in p1 and p2? Adjust your gameplay based on what the guild needs
  • No Kingsmourne phase, this is the ideal role for a subtlety rogue on this fight, in my opinion. It means you can get a lot of value out of your Flagellation windows as you have Lost Soul funnel for each of them
  • 1st Kingsmourne phase, you might want to hold your on pull Flagellation
  • 2nd Kingsmourne phase, you have to make sure you get good stacks out of your Flagellation for that extra CDR so that it is up for the start of the first intermission

In P1, you can use Shadow Step to quickly reach people with opposing Blasphemy colors. It doesn’t matter if there are people between you and your step target.

During the first intermission, you want to ideally instantly send your Flagellation on the Remnant and start to build stacks; important that you get a lot of stacks on this so that you can use it again at the end of the intermission. Use the many adds that spawn to funnel damage into the Remnant. Make sure to swap to the monstrous soul once it reaches 40% hp.

There are a few things to note when you enter P2:

  • Use Cheap Shot on each fear add that spawns. This is where Prey on the Weak comes into play and gives everyone in your raid 10% more damage for a few seconds on that add; underrated utility since these adds have to die asap
  • You can Kidney Shot the first fear add, and the last fear add in each set. The last add CC is typically paired with a Solar Beam into your Kidney Shot as an ideal way to keep the add from casting fear since the cast itself is around 0.5 seconds long and can be easily missed

2nd intermission is just a copy of the first, same gameplay.

Trinkets: Use double-on-use trinkets if possible, as both can be used in the intermission, where most of your damage will happen. Amplifies the worth of these trinkets by a lot. The First Sigil is a trinket with very high value in the intermission and can be interesting here, despite not being great overall.

Cloak of Shadows usage: There’s really no stand out moment for Cloak of Shadows. If you get sent down into the Kingsmourne phase you can cloak some of the damage or pools for better uptime. You can also cloak the Shadow Word: Pain debuff if it overlaps with the healing absorb circle.

Feint usage: You can Feint the big aoe damage he does in every phase, big value.

In last phase, you are probably hard assigned to a group of people that clear their debuff, so there’s not a lot of improvisation done here. Clear your debuff and smack the boss.

Lords of Dread

2T Cleave
15
25
30
35
40
45
50

Legendary:

Venthyr: Unity + Akaari’s Soul Fragment or Deathly Shadows

Kyrian: Unity + Akaari’s Soul Fragment

Talents:

With how we play 2-target cleave, it’s just single target with Rupture spreading. So no big talent changes.

Notes:

This is, unfortunately, a fight where you might consider respeccing because of how bad subtlety is at dealing with 2-target cleave.

But if you insist on playing subtlety, there are three builds that I would recommend:

  • Venthyr with Akaari’s Soul Fragment. It can be decent if you get lucky 4p procs during the damage phase. In general, you’re just playing for single target, so this is a fine build to use.
  • Venthyr with Deathly Shadows. This is a more interesting take on the fight in my opinion. You’re basically just putting all your eggs into the damage phase basket
  • Kyrian with Akaari’s Soul Fragment. Kyrian is the best 2-target cleave build simc wise, but it’s consistent damage, it lacks the punch of a Flagellation window. Still a valid build for this boss and could be played based on familiarity rather than optimization

It’s a straightforward fight; all you need to do is dodge stuff on the ground and play around the damage phase windows to maximize damage output. This roughly means you will do the following:

  • Hold your on-pull Flagellation for the damage phase that comes at around 55 seconds into the fight. Do not try to greed it on pull, yes you can get it back up for the damage phase, but it requires 4p procs to pull off
  • Storm when not in Shadow Dance, important to keep the CDR rolling
  • When playing Deathly Shadows, hold your Vanish for each damage phase, they naturally line up so that shouldn’t be an issue

Trinkets: I would suggest playing a 2 min trinket if you have it and then something passive like Phial of Putrefaction or Elegy of the Eternals. If you have nothing but 3 min trinkets, you should use it on pull and on cooldown, this should make it line up with the 2nd damage phase and the 4th damage phase. It’s basically the best you can do out of a bad situation.

Cloak of Shadows usage: You can use it for every damage phase, where you will also take a lot of damage. Reduce some damage taken.

Feint usage: You can feint during the damage phase if you have any downtime where you’re out of Shadow Dance.

Rygelon

Single Target
15
25
30
35
40
45
50

Legendary:

Kyrian: UnityAkaari’s Soul Fragment

Talents:

Pure single target fight with basic talents.

Notes:

Sim yourself for patchwerk and use whatever loadout you’re getting. This fight is full single target and doesn’t have any significant downtime.

There’s not much to say about Rygelon. It’s a very scripted fight that doesn’t leave much room for improvisation. If you didn’t know this already, I am disappointed, but I will tell you anyway to make sure it’s covered. The orb “downstairs” that you stand inside takes 99% reduced damage, do NOT hit this for anything except building combo points with Shuriken Storm when you’re not in Shadow Dance.

Make sure you deal damage to the Unstable Matter that you use to go “downstairs” with during the big bang, this is available whenever you step into a Quasar hole. Be wary of using Shadowstep on the boss; this might land you inside a Quasar hole which is basically a wipe.

Other than that, pray for 4p procs whenever there’s 4 Quasar’s alive for max output and a chance for Shadow Blades procs.

Trinkets: Just play your best setup.

Cloak of Shadows usage: Use it when you enter the “downstairs” phase during the intermissions, and you have to wait in the pools on the ground for a few seconds. This negates a lot of damage taken and is a high-value usage of Cloak.

Feint usage: This is one of those unicorn fights where Feint is incredibly powerful and works on most abilities. There are a few important points of the fight where Feint will give more value than normally, and that’s the last Quasars of each phase. For reference, I used Feint 9 times on this boss on our first kill, you can Feint a lot of things, but it will hurt your damage output, so keep that in mind.

The Jailer

Single Target
15
25
30
35
40
45
50

Legendary:

Kyrian: Unity + Akaari's Soul Fragment

Talents explanation:

Single target fight with basic talents.

Notes:

Another (almost) pure single target fight. The Jailer is one of the most challenging fights ever, and it will be hard to break down every piece of important information you might need to succeed on this fight. A lot of it is simply down to personal intuition and gameplay knowledge.

P1:

  • Consider the room divided into a bunch of triangles; each triangle represents an area for where to drop your bombs. Each of these triangles has a thick line that will represent every "right side" of most Weakauras available for this boss.
  • From closest to Azeroth to the edge of the platform, you got: Front/Right/Back right on this thick line, and once you have hammered this into your brain, you will quickly identify where the other holes are placed in the triangle. This is important to learn as it will impact your overall DPS on this fight a lot, optimizing your movement
  • Every time you have jumped into a hole with bomb, you can spam your Shadowstep button and get back to the boss instantly
  • When he does his pull-in, make sure you stay for a while and keep doing damage until there's like 1-0.5 seconds left on the cast, and then take gateway. If there is no gateway, you can just Shadowstep last second
  • Use Cloak of Shadows to avoid having downtime during the mind-controls (MC:s) that he is casting; very important you realize that this is P1 MC:s and not the ones you group up with during P2. Cloaking these MC:s also means you won't get the Torment debuff that almost always happens right after a MC cast. Giving your team more space while you take less damage
  • Do not cloak the Azerite beams that you channel into the middle. They give you a stacking damage buff; cloaking this will remove the damage buff, and it also means you can get back to back bombs, very bad
  • Talk with your other melee players and make sure to tell them that you should always try to do the same positioning with Torments to avoid panic and confusion while also giving more space to each other
  • If you are assigned to do the 3rd tank soak, which overlaps with the MC lines: take it easy, breathe and let the lines happen before you run into the tank soak. Try position yourself close to your tank but DO NOT cross your MC line on top of the tank, they are rooted during this and will get MC:d. Just take it easy. You have plenty of time

P2:

  • Torments will now leave an echoing Torment wherever you dropped the original, which means you just have to drop the circle and move every single time
  • The Rune of Damnation is now an MC instead of a bomb
  • P2 for melee is quite simple, you have to make sure your team is spreading with the Torment, and you have to dodge the swirlies from the Azerite beam soaks
  • There is a nasty overlap where you have MC runes into Torment spread into knockback, and this all happens simultaneously. Make sure you have cloak for this overlap and use it to drop your Torment circle early, step the boss right as the knockback happens and make sure to help your team break out the people with MC
  • You can Feint every single Worldcracker cast, which does a decent chunk of aoe damage
  • Assist with CC:ing the MC:d people with Kidney Shot, Cheap Shot, basically anything that can keep them in place if they are running towards the edge

P3:

  • The most dangerous part of P3 is when you go to 6 stacks of the Azerite debuff. The damage from this spell can't be feinted unless you talent into Elusiveness. So what I did for progression was to time a health pot between the ticks to make 100% sure I live that damage
  • Apart from that moment, you are kinda just at the mercy of your tank positioning during this phase, so there is little improvisation possible
  • Use Shadowstep on knockbacks, sometimes the boss might be placed, so his back is right next to a hole. Make sure you position accordingly and try to live the knockback without using step when this happens. Focus on boss positioning and pay attention
  • If you have the option, you should definitely do the dagger swaps with Edge of Night on the Jailer. He spends quite a long time sub 25% hp because of how P4 works

P4:

  • Quite simple phase for melee. Just make sure you run into the right hole with the bomb and remember that you can spread far back with the Torments that drop Defile (because of Shadowstep)
  • Very important to Feint before he does his Meteor Cleave; this thing does a lot of damage and might kill you if you don't have Cheat Death up
  • Be careful with how you use cloak on the Torments in this phase as you will drop a Defile puddle before others if you cloak it early. So if they are not paying attention, you might wipe the raid

Trinkets: Just play your best single target setup.

Cloak of Shadows usage: There is an interesting interaction with Cloak of Shadows on the Azerite beams that give you a damage buff. If you pre-cloak them, you will not take damage but still get the damage increase stacks. See the phase breakdown for more information.

Feint usage: This is also explained in the phase breakdown on this boss.

Sanctum of Domination

The Tarragrue

Single Target
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

For Tarragrue, the most important thing for damage is to have the correct anima powers. These are the ones that I suggest:

  1. Huddled Carvings
  2. Potent Acid Gland
  3. Elethium Weights
  4. Erratic Howler
  5. Twisted Samophlange
  6. Heart-Seeking Fang

Then you have the more risky anima powers that are very powerful if you are allowed to take them:

  1. Lumbering Form
  2. Ten of Towers

Gameplay-wise you should use your Cloak of Shadows to keep uptime on the boss during Hungering Mist.

If Symbols of Death or Flagellation is about to come up and the boss is close to 10%, it is best to hold them to avoid wasting both during the long stun.

Eye of the Jailer

Single Target
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

Use Shadowstep on the boss when Annihilating Glare has gone past the middle of the platform to avoid taking the chain across the platform to sustain 100% uptime.

If you use Cloak of Shadows when there are 2-3 seconds left of either Scorn or Ire, you will drop the debuff, which means you can move freely and take reduced damage as well.

Make sure to use Shuriken Storm when the Stygian Abductor is active, and you are not in Shadow Dance. You can also use Rupture on the abductor if you know it's going to live for about 15 seconds. But most importantly, you should use it as a way to build combo points with Shuriken Storm.

Keep using all your cooldowns on all parts of the fight. We don't want to hold anything for Bloodlust; you only want to save a cooldown if you are close to a phase change.

The Nine

Single Target / Cleave
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

On the surface, this fight looks like a 2-target fight, but most of it is spent fighting Skyja, so we want to use our single target talents and build.

Whenever Signe and Kyra are active, you want to use Shuriken Storm when you don't have Shadow Dance up. There is a slight alteration when we have Skyja, Signe, Kyra, and the Formless Mass active simultaneously, then you also want to use Shuriken Storm in Shadow Dance.

Use evasion if you need uptime during Wings of Rage, and you can not avoid the AoE. You can use Cloak of Shadows for multiple things on the Nine, and neither option is game-breaking.

Option 1: Arthura's Crushing Gaze

Option 2: Fragments of Destiny (can be a dangerous play)

Option 3: Daschla's Mighty Impact

Make sure you delay your cooldowns if you know the 90% damage reduction from Annhylde's Bright Aegis is about to come. Otherwise, use them on cooldown.

Remnant of Ner'zhul

Single Target
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

You have a few options if you have to find a way to get back to the platform after getting Malevolence.

  1. You can use Shadowstep on the boss. However, it needs to be close enough, so you might want to talk with your tanks.
  2. You can face sideways to avoid being knocked off the platform and then use Shadowstep on a friendly target.
  3. The last solution is to use Shadowstep on something like the Summon Black Ox Statue.

If Malevolence is on another player, you can use Shadowstep on the boss every single time.

Cloak of Shadows should be used right before Shatter. I personally use it on the 60% Shatter because you will have it up again for the last parts of the encounter while negating a lot of damage.

The finesse conduit Quick Decisions is perfect for this encounter because you will be able to use Shadowstep quite a lot.

Use all your cooldowns when they are up apart from the second Symbols of Death around 0:30-0:35. You want to avoid using your cooldowns here because you might get Malevolence in the middle of the Symbols window.

Soulrender Dormazain

Single Target / Funnel
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

You should take the 5th Warmonger Shackles so you can use Cloak of Shadows while breaking it because it overlaps with Tormented Eruptions.

Save your Shuriken Tornado for when the first Mawsworn Agonizer group spawns, which is 0:25 into the fight. You want to focus down the Mawsworn Overlord whenever it is up. Use your Shuriken Tornado and all your combo points for Eviscerate into either the Overlord or Dormazain himself. You only want to use Black Powder when absolutely necessary, and remember to kick the Agonizers whenever possible.

Save your cooldowns during the Tormented Eruptions; otherwise, you want to use them on cooldown.

Painsmith Raznal

Single Target / Funnel
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

The most important thing during Painsmith progression is the damage you can deal to the Spiked Balls without dying. This means that you should get some kind of melee range indicator and a way to see your own position.

During the intermission, you want to make sure to Shuriken Storm on the balls and spam Slice and Dice to reduce the cooldown on Shadow Dance. If you have both Dance charges ready, just make sure to keep 6 combo points and cast Slice and Dice as soon as the intermission ends.

Make sure to save your Shuriken Tornado for the first Spiked Balls and then use it to Funnel Eviscerates into the priority ball. Use Tornado to Funnel Eviscerates off the Shadowsteel Embers into the boss after the intermission.

Guardian of the First Ones

Single Target
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

Cloak of Shadows can be used to soak the tank mechanic. Make sure you have it ready and stay in the soak for the entire duration (approximately 4.5 seconds).

There is not a lot to say about this fight. Just pump all you can.

Fatescribe Roh-Kalo

Single Target / Funnel
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

Use your Cloak of Shadows to altogether remove the Call of Eternity mechanic, so it won't blow up, and therefore it will not leave an Echo of Eternity.

If you have to do Realign Fate, make sure you use everything to survive and keep the Blood set ticking on the Monstrosity adds for healing.

Use your Shuriken Tornado on the adds that spawn from Invoke Destiny and use them to Funnel into the boss  if you need boss damage or you are in the last phase.

Another fight where you can use cooldowns on cooldown.

Kel'Thuzad

Single Target
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

With the update to Kel’Thuzad you want to do as much boss damage as possible which means that you want to use any add or target you can to Funnel into Kel’Thuzad instead of using Black Powder.

Subtlety Rogue is one of the better specs to go into the Phylactery Realm because you have frequent cooldowns and good survivability.

You might also be called to soak the Frost Blast with Feint, so make sure to use the Nimble Fingers conduit.

Use all of your mobility to kill the Soul Fracture adds and lock them down using Cheap Shot and Kidney Shot if needed.

If you, for some reason, do not have to go into the Phylactery Realm, you can use our Funnel capabilities to normalize Unstoppable Abomination HP differences. Meaning you hit the highest hp Abomination until it is similar to the others.

Sylvanas Windrunner

Single Target / AoE
15
25
30
35
40
45
50

Legendary:

Venthyr: Obedience

Kyrian: Resounding Clarity

Notes:

Phase 1

This encounter is a fight where Shadowstep comes in handy, especially during phase 1. Sylvanas will jump around a lot, and with two Shadowsteps, you have ways to keep up with her.

One neat trick on this fight is to use Cloak of Shadows just before the P1 intermission, Domination Chains, lashes onto you; it completely removes the damage until your arrow is dead.

Phase 2

Save Shadow Blades for the first burn phase in P2. If you are Venthyr, you want to use Flagellation on cooldown, which means you want to use it on the first bridge on Souljudge or Goliath and then on the Colossus after the first P2 burn. If you are not doing the Colossus, feel free to save it for both Sylvanas burn phases.

Subtlety should be one of the best specs to kill the Colossus since it will have cooldowns without sacrificing too much in other places.

Phase 3

Use a singular Shadow Dance when she first lands in phase 3. Then you want to use Symbols of Death with Dance after the first Veil of Darkness is over. Use the rest of your cooldowns once you have landed on the second platform.

Throughout phase 3, you have to be mindful of the Veil of Darkness timer. A tip is to put Veil of Darkness on a spoken timer in your boss mod addon.

Use Cloak of Shadows to soak one of the Merciless pools that overlap with Veil of Darkness on platform 3. If you are not assigned to soak, use it to reduce damage taken from the Wailing Arrows.

The Blood set is really good on Sylvanas in particular, it provides you with sustained healing across all phases, and it keeps doing damage to Sylvanas while she leaps into the air to do her Veil of Darkness.

Quick Decisions is also almost a must-have in this fight. The reduced cooldown on Shadowstep comes in handy in every single phase of this fight. You will also Feint a lot so make sure to use Nimble Fingers.

Castle Nathria

Shriekwing

Single Target
15
25
30
35
40
45
50

Feint works on Earsplitting Shriek to reduce the unavoidable damage while hiding even more.

Huntsman Altimor

Single Target / Cleave
15
25
30
35
40
45
50

Make sure to use CC’s on the Shades to stack the increased damage debuff on them. Blind works very well here.

Sun King's Salvation

Cleave
15
25
30
35
40
45
50

Soul Infusers can be CC’d with Kidney Shot, Cheap shot etc. 

Cloak of shadows works against all Fire Damage spells in this fight, especially Ember Blast which you have to soak as a group.

Artificer Xy'mox

Single Target
15
25
30
35
40
45
50

Cloak of shadows works to immune the Spirits in Phase 1.

Hungering Destroyer

Single Target
15
25
30
35
40
45
50

Cloak works on pretty much everything here, but it should be used to clear Obliterating Rifts that spawn after Expunge (Heroic and Mythic only).

Lady Inerva Darkvein

Single Target / Cleave
15
25
30
35
40
45
50

Make sure to place yourself properly so on add spawns you hit all targets with Shuriken Storm. Niya’s Tools: Poison works on the adds here.

The Council of Blood

Single Target
15
25
30
35
40
45
50

If assigned to a very far spot during the dance phase, use double step on friendly players into Vanish Shadowstrike to get back quickly.

Sludgefist

15
25
30
35
40
45
50

Use Feint to reduce incoming splash damage and damage from soaking the boulders. 

Hold cooldowns until the first heedless Charge (1 minute into the fight) as the fight duration is around 5 minutes early on, which gives you two uses of Blades anyway.

Stone Legion Generals

Cleave
15
25
30
35
40
45
50

Sire Denathrius

Single Target / Cleave
15
25
30
35
40
45
50

You can Shadowstep to adds in Phase 2 or to other players in Phase 1 to get to the middle quicker.