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Comment by mrdiablo

Clear his room from the exhumed spirits before engaging him by walking over the burning tombs!

After that quite simply
- Turn him out of group because of his Soul Blast (you can't dodge it as tank)
- Kill your soul in the other phase and click it.
- Run away from the Void Devastation impacts

Comment by Chaoslord5

For this fight you will need to move out from the Void Vortex, avoid the purple spots for Void Devastation as they will get hit not long after showing up on the ground (they hurt a lot).

When he summons adds the tank needs to pick them up, they can be aoed down

When he casts Soul Shred kill your spirit and click it to receive a buff.

This is from a normal clear

Comment by Hallwacker

No sounds files yet? that's a shame. Flee from your former masters!

Comment by Riencel

Nhallish is a void god, the 5th of his kind, the 4th revealed in WoD an the only that ~~has an awesome visual~~ seems not to be borned from a dead naaru.
The other four are Entropius (TBC), Xan, Decimatus and Karnoth.

Edit: Wowhead classified it as a undead.

Comment by restoemu

check out the fight on heroic
http://youtu.be/3oEldCgU5AU

Comment by Maximustitan

Clear the room worked. After there were no add's spawned

Comment by jjanchan

CHALLENGE MODE TIPS

Some of the following neat tricks require specific classes, but can shave time off to let you snag that Gold you may be gunning for!

Obviously these tips can also be used on Normal, Heroic, or Mythic difficulties, although they are not as necessary.

Sadana Bloodfury

If you move Saldana outside of the ring of runes towards the entrance to the room, you can effectively avoid having to the kill Defiled Spirit throughout the encounter and focus all DPS on her. You will have to dodge Daggerfall when they spawn, but the range for each is only 4 yards, so it is easy to avoid.
Defiled Spirits are adds that walk slowly towards the boss during Dark Communion, and will heal and buff the boss if they reach her before her channel of Dark Communion is complete (it is 20 seconds long). If the add DOES NOT reach her by the end of the cast, it despawns!

Position a player inside the circle of runes to be positioned to deal with the add when it spawns.

The best class to assign to the add is a Hunter. Binding Shot is extremely effective if used when the add spawns, with Concussive Shot following to keep it slowed until it despawns.

Although I have not tested this personally, a Shaman may be able to do the same with the use of , Earthgrab Totem/, and subsequently with +/- Thunderstorm.

TL;DR: Slow, root and stun the Defiled Spirit add for the duration of Dark Communion to avoid having to waste DPS on killing it.

Nhallish

During Void Devastation, when purple pools spawn all over the ground and must be avoided, the use of the reflective abilities can put a MASSIVE DoT on the boss, thus shortening the encounter significantly.

Abilities that work include:

Shaman - with Charred Glyph
Hunter - Deterrence with Charred Glyph
Warrior - Spell Reflection/Mass Spell Reflection

To make use of this, pop the appropriate reflective ability, and stand in a purple void zone until it disappears to put the DoT on the boss. Be sure not to stand in any other pools!

The WeakAura at the bottom of this post can be used to more easily track when is active. It can be modified for other abilities.

TL;DR: Reflect a purple pool onto the boss during Void Devastation if you have such an ability.

Ner'zhul

During the Ritual of Bones, a Hunter or Shaman can COMPLETELY negate this mechanic, thus saving you a lot of DPS which would have been wasted on the Ritual of Bones add.

Abilities that work include:

Shaman - with Charred Glyph
Hunter - Deterrence with Charred Glyph

To execute this, when Ritual of Bones starts, the shaman should use (or the hunter use Deterrence) and then that player should STAND IN the purple ground effect behind the Ritual of Bones skeleton. This will reflect the damage onto that add, thus clearing a space for your group WITHOUT even attacking it at all! Keep in mind that the add will take a few seconds to die, as it needs to take a couple ticks of damage.

As Ritual of Bones comes every 50-55 seconds or so, a hunter can handle two consecutive rituals, and a third if is talented (if Deterrence is used early in the first Ritual of Bones, it should be off CD late in the third one). A shaman can handle every Ritual of Bones phase even with a glyphed .

Note: In theory, this should also work with Spell Reflection/Mass Spell Reflection, although I haven't tested it. The uncertainty lies in the fact that 2 ticks of damage are required to kill the Ritual of Bones add, so this ability may not be enough.

The WeakAura at the bottom of this post can be used to more easily track when is active. It can be modified for other abilities.

TL;DR: Reflect the purple swirls of death during Ritual of Bones to kill the adds and clear space very easily.

Below I've listed a WeakAura string that can be used to notify you when is active. It can be modified for use with other spells.

To use it, you need to install the WeakAuras 2 addon, then do the following:

Type /wa in chat to open the WeakAura interface
Click New, then select Import
Copy the text in the following code box and paste it into the WeakAura import field, then click Done
Click the "Import" button on the confirmation in the middle of the screen to add the aura

dadDdaGEKk1UubMjfuZLcz2qCBQStiTxYUHA)cj)KcyyQq)gvdLcYGfsnCboisvoMk5Civ1cPKwksfwmfQLtvpePIEkyzQipxKPIYKPutx6Icbxw56i2isLSzbTDKYhPe9zK8DHqpwLA0QGgVq0jvrDyrDAvDEH6Vu03OannkH1LycEbNXD(W89m68nhNmccgcIjAUe)mT0Zjy7htX4DobjbNo46GJhCzqbob2cSftabx)trnVyckVZXIdMqTqvq9pf18IjOXbtqQ5ssciPzwENdn7MSkGKM5JPnFAYybJ2WvaJ35euENdn7Mal9Cc2(XurfnJ35eqWJ2WvqMuUasAMe8xzvq5DowCWeQfciPzwENJfhmzvvWH7PoScL(hfGWZ2IjW(dd)BcsJftGJG0xmvvb(89etGJG0xmvvbnJmCftGJG0xmvvbH57(CSycCeK(IPQkWZrMycCeK(IPQQkiKJl809e6Lbf4h1ZXS4Gj4V5ybp(R5n3fGSoBHEjitkxgl4TfyPNtW2pMsq22(7ZXzeZ6FkQ5tIj0lXeu)trnVycACWeKAUKKacE0gUcYKYfqsZS8ohA2nzvWOnCfW4DobjIXJ2W1q(f(rkamuemSHfqWFfeGKJNxq5Do0SBcOR3VOIociZnCZirfnJ35eqsZKG)kRckVZXIdMqVeKigpAdxGeg(rkWKoPhWmbg9OdMasAML35yXbtwfqsZ8X0Mpnzvvabx)trnVyQQQcI4B3dfk9pkisdegMwf6jlokatCm)trnFsONeeBGWW0QqVoDuG9NcqYXNV5ybNXD(W89m68nhNmccgcIjAUe)mT0Zjy7htX4Dovb0e6LfNUuLa

To modify the aura to work for a buff like Deterrence or Spell Reflection, do the following:

Select the "Trigger" tab
Change the "Type" to Aura
In the "Aura Name or ID" box, type the name of the buff (e.g. Mass Spell Reflection) and click "Okay"
Make sure the "Unit" dropdown shows "Player, and the "Aura Type" is "Buff"

Comment by Wisely

One expansion later, I have FINALLY realized what he meant by "clinging to the corpse of a dying god" when you defeat him. There is a body of a sleeping titan within Azeroth's core, one we keep trying to protect, and it's likely Nhallish meant that. The void lords seek to consume such unborn titans, and it is likely the corruption goes as deep. Eerie and scary, if you think about it...