2018-0228: Priest Order Hall

Done.  Left the game again 28jan2019.
Battle for Azeroth turned out to be as bad as Legion was good.

Priest Order Hall: Netherlight Temple

Location:
Planet: Azeroth
Continent: Broken Isles
Region: hard to tell.  Connected to Dalaran (above Broken Isles) through a portal.
Where: Netherlight Temple
Specifically: Lovely design. Very smooth and easy on the eye.
Faction:

Your title in the order hall: High Priest

What one does there:
Get quests
Set missions
--as in Warlords of Draenor, the Legion missions are done by named NPCs.
--examples:,
--also available: nameless followers (fel servants of one sort or another)
Upgrade permanent followers from mission rewards
Do order research: most of this is done at the 110 level
Edit the artifact weapon at the weapon forge.  This is the only place for warlocks to update traits.
Train temporary troops; here called 'ghouls'
Engrave weapons with enchantments
As one accomplishes more, be able to change the weapon's appearance with the artifact forge

How to get there:
In the new (Legion expansion) Dalaran, there is a portal to NT in the Greyfang Enclave.

Return from Netherlight Temple:
There is a portal in Netherlight Temple to the Greyfang Enclave in Dalaran.

Artifact weapons: priests can only update their artifact weapons in Netherlight Temple.  Find the highest level of the Order Hall.  The forge is on the floor in the centre of the room.

Discipline (healer, sort of):
--Scepter of Sargeras, staff
--relic slots: Fel, Fire, (initially locked) Fel

Shadow: (DPS only)
--
--relic slots: Shadow

Holy (healer)
--
--relic slots: 

------

Notes from early on with the warlock:

My level 98 Destruction Warlock, Chronoslock, on 20170503 attained the

1. new Dalaran hearthstone
2. armor upgrades: 560 average to 587 average
3. from Stormwind Vanguard Staff (staff, level 685; replaced 536)
4. from Accolade of House Wrynne (trinket, level 685; replaced 565)
5. from Signet of Stormwind (ring, level 640; replaced 515)
6. an invitation from the faction 'Council of the Black Harvest.'
7. There was a summoning; the demon showed, then the demon imprisoned my warlock and 3 others.
8. One obtains 'A Tome of Blighted Instruments' then tries to escape.
9. I got the book, got away from the demons, but hearthing back to Dalaran did not constitute escape.  Crap.
10. Start over.
11. Did the same stuff, only more efficiently.  Worked this time.  Go figure.
12. A portal to the warlock meeting place seems to be the Ring underneath Dalaran in what was called the Underbelly.
13. Got the quest to get the  Destruction artifact weapon.
14. Finished the quest, got the weapon
15. Got the invite to the order hall
16. Got my character installed as leader (Netherlord)
17. Got my artifact weapon properly initialized at the artifact forge.