Magni Bronzebeard

Champions of Azeroth emissary (turn in for world quests) is located in Silithus 42.16 44.27 for both factions.

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• Horde portal location (In Dazar'alor): https://www.youtube.com/watch?v=f3iF7sfWSmE
  /way Dazar'alor:Zuldazar 51.5 46.9 Horde portal to Silithus in portals room
  
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• 
  Alliance portal location (In Bolarus): https://www.youtube.com/watch?v=hfFcSRqBdQ0
  /way Boralus 70.34 17.92 enter portals room and use portal to Silithus
  
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All BfA factions, vendors and associated world quests

Spoiler

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Side

Faction

Zone

World Quest

Emissary/vendor

Achievement

Emissary Location Video

1

Both

[faction=2164]

Silithus

[quest=50562]

Magni Bronzebeard

Champions of Azeroth

Horde PoV / Alliance PoV

2

Both

[faction=2163]

Zuldazar

[quest=50604]

[npc=134345]

Tortollan Seekers

Horde PoV / Alliance PoV

3

Horde

[faction=2157]

Zuldazar

[quest=50606]

[npc=135447]

Champion of the Honorbound

https://youtu.be/WhRxb62y4qQ

4

Horde

[faction=2156]

Nazmir

[quest=50602]

[npc=135459]

Talanji's Expedition

https://youtu.be/z7HSjf294_M

5

Horde

[faction=2103]

Zuldazar

[quest=50598]

Natal'hakata

Zandalari Empire

https://youtu.be/CioXPdcu7NQ

6

Horde

[faction=2158]

Vol'dun

[quest=50603]

[npc=135804]

The Voldunai

https://youtu.be/eRQ5VyvhD8E

7

Alliance

[faction=2159]

Tiragarde

[quest=50605]

[npc=135446]

Champion of the 7th Legion

https://youtu.be/EunvrtFk00c

8

Alliance

[faction=2160]

Tiragarde

[quest=50599]

[npc=135808]

Proudmoore Admiralty

https://youtu.be/ZafAfkO7qnQ

9

Alliance

[faction=2162]

Stormsong

[quest=50601]

[npc=135800]

[achievement=12953]

https://youtu.be/7poSJ0aM5X4

10

Alliance

[faction=2161]

Drustvar

[quest=50600]

[npc=135815]

[achievement=12952]

https://youtu.be/FGpRMbZw--w

TomTom coordinates:
/way Silithus 42.16 44.27 Champions of Azeroth Magni Bronzebeard Magni's Encampment
/way Zuldazar 71.50 30.34 Tortollan Seekers [npc=134345] Scaletrader Post
/way Stormsong Valley 40.51 36.49 Tortollan Seekers [npc=135793] Seekers' Vista
/way Zuldazar 58.06 62.66 The Honorbound [npc=135447] Port of Zandalar
/way Nazmir 39.11 79.47 Talanji's Expedition [npc=135459] Zul'jan Ruins
/way Zuldazar 58.35 44.40 Zandalari Empire Natal'hakata The Great Seal
/way Vol'dun 56.70 49.80 Voldunai [npc=135804] Vulpera Hideaway
/way Tiragarde Sound 74.10 25.81 7th Legion [npc=135446] Boralus Harbor
/way Tiragarde Sound 73.71 25.02 Proudmoore Admiralty [npc=135808] Harbormaster's Office
/way Stormsong Valley 59.27 69.37 Storm's Wake [npc=135800] Brennadam
/way Drustvar 37.80 49.00 Order of Embers [npc=135815] Arom Stand

PS: if you feel lost and can't find him, you are probably in a wrong phase.
Silithus has past and current versions and you can switch between them near the north-east road to the Un'goro Crater
Zidormi mark on the map

If you have leveled an alt in 8.2 and wonder how your neck gets upgraded:

Complete the Nazjarar intro quests, up to the bit where you activate the Azorite forge.
The levels you used to get are granted at the end of the quest line with MOTHER when she shoots you to level 35.

Well how do I get this quest?