Servant of N'Zoth

Eridana-ZJ's Guide to getting N'lyeth, Sliver of N'zoth

A couple of things I’ve noticed and how I got this achievement done:

Shortly after you kill one or two of your own faction, there is a high probability that you will become bounty hunted. This makes killing people of your own faction difficult since you can’t fly and the opposite faction is chasing you down.

I was bouncing around Nazjatar trying to get it done, but would get overrun when the bounty on me happened.
I tried logging out for a bit to see if bounty would drop, it dropped the bounty, kept assassin, and dropped my quest.
Hearthing or teleporting to other BFA zones seems to also drop the quest.

Wouldn’t it be great if you could kill some of your faction and hide from the prying eyes of bounty hunters? You can!
But I recommend gathering some sacrifices, I mean a few friends, to help. 
If you get 4 sacri-, er, friends, you can be done in 21 minutes after accepting your tentacles from N'Zoth.

This is a great week to get the toy because of Call to Arms: Nazjatar. 
Why? 
Mardivh’s Lab is why. :-D

This place has been a favorite spot to hide while trolling. It’s also a perfect spot to hang out and bathe in your tentacly glory while you’re a bounty.

So. While you’re waiting here, invite 4 friends over to the mouth of the cave. I was able to invite them to group to make sure they were in the same shard as of today. Once they are there, have them take off all their gear, pop out of the cave for a few seconds, mow them all down with focusing iris, and make your way back to the safety of Mardivh’s lab.

Your buddies will have a 10 minute debuff not allowing their deaths to count towards your progress. They can put their gear back on and fly off to do other stuff and come back in 10 minutes for more laser to the face. Some will try to find you in the cave, but it’s been my experience that people chasing your bounty will just fly away, because they realize you’re trolling them in the cave. When your buddies come back, have them tell you when the coast is clear and mow them down again.

Repeat the process three times and you're done. This should take a little over 20 minutes after you use the sliver. Make sure you're at 100% HP before using it! 
Join me and fight for N’Zoth! <3

UPDATE: I've been reading other comments that say their quest item kills them. This leads me to believe that the Sliver of N'Zoth's damage effect can CRIT!
I noticed it hurting more than it should while trying to do the quest and didn't really put much thought into it. Sometimes it would chunk me down to about 15-20% health, but would never kill me. Even now that I have the toy it will chunk me every once in a while.

The only reason I think I have been surviving every time it crits is because my WPVP set has ~12% versatility. I highly suggest using a defensive or having a decent amount of versatility when you use the quest item/toy. Keep in mind that it is shadow damage.

What I learned from being an assassin five times, picking up the quest Servant of N'Zoth five times and failing four times

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Basics

• You must become an assassin before N'Zoth will offer you the quest Servant of N'Zoth. Accept immediately. You have at least 10 minutes to click on the dagger icon [item=174020]. This casts the spell [spell=316577], transforming you into a void wrath with the ability to kill members of your faction. Like the tool tip says, you become Shath'Yar, breaking allegiance to your faction and serving only N'Zoth. Use the 10+ minutes to join or start a group and line up willing sacrifices.
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• Once you click on [item=174020], you have 60 minutes to kill 10 members of your faction and not die yourself. See the large yellow eyeball timer at the top of the screen.
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• You can fly between (Edit) BFA zones, but you can't use portals or hearthstones or log out.

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Hard to tell my targets from the opposite faction

• Once you become a void wraith, your faction's nameplates change to enemy colors (red at a distance, class colors up close). They are your targets.
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• Check the race on a nameplate if it isn't obvious whether a player is your target or the opposite faction. Some races, like Pandarans, could be either faction and aren't worth the risk to attack.

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Willing sacrifices

• Ask in local chat if anyone is willing to be a sacrifice. Two random people agreed!
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• Ask a friend or guildie to be a sacrifice. They can sacrifice themselves once every 10 minutes, but must stay online for the timer to count down.
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• Be sure a friend acting as a sacrifice is on your shard. To do that, start a group and invite your sacrifice. If your sacrifice is in the same zone, but not part of your group and you can't see them, ask them to say something in Chat -- so the group leader can click on their name and Invite.
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• If you die, you fail the quest. Become a sacrifice. Abandon the quest immediately, because you can't pick up the Servant of N'Zoth quest for another 60 minutes.
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• Sacrifices should put their weapons and maybe some gear in their bag. Their gear won't be damaged if they don't, but it's easier to dispatch a tank if auto attack isn't on.
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Doing the quest in a group

• This is the best approach.
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• Find out if other members of your group have clicked on the icon of [item=174020] yet. If some members of the group haven't, they'll have enemy nameplate colors, so try not to kill them.
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• Use markers to track group members.
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• Find out how many kills each one needs.
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• If someone in your group becomes a marked Assassin and can't fly, keep them in your sights.

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Other

• Although you are now an enemy to your faction, you keep the language and can use chat.
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• Stay out of your base. Pick off stragglers. Avoid the other faction.
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• Be cautious.
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• sbenson says above to use gear or buffs with Versatility.
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• Confirming you can fly from Drustvar to Mechagon without losing the Servant of N'Zoth quest. But you cannot fly from Stormsong Valley to Nazjatar. If you fly from Nazmir to where Nazjatar should be, you’ll find there is nothing under the water or above the water. You will die of fatigue and even your corpse will die when you return to pick up your body.
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The Toy [item=175246]

• Once you successfully complete the quest you get the achievement Servant of N'Zoth, the title Servant of N'Zoth and the toy [item=175246] goes into your inventory.
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• The toy turns you into a void wrath for 60 minutes. Like in the quest, you become Shath'Yar with the ability to kill your own faction when War Mode is on in Kul Tiras, Zandalar, Uldum and Vale of Eternal Blossoms. Not an exploit! 60 minutes between uses.

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This comment helped me get it today. Asked a few friends and guildies and made a group to help others get it this way aswell!