20180228: Mage Order Hall

Done.  Left the game again 28jan2019.

Battle for Azeroth turned out to be as bad as Legion was good.

Mage Order Hall: Hall of the Guardian

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

Your title in the order hall: 

What one does there:
Get quests
Set missions
--as in Warlords of Draenor, the Legion missions are done by named NPCs.
--also available: nameless followers (water spirits, invokers)
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, by armour upgrades and enchanted tools that give them extra power.'
As one accomplishes more, be able to change the weapon's appearance with the artifact forge

How to get there:
Buy the teleport skill to the Mage order hall, Hall of the Guardian.  There is no other way in!

Return from Hall of the Guardian:
There is a portal in Hall of the Guardian to Dalaran. Alternately, teleport (mage skill) to Dalaran.

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

Arcane (DPS):
--Aluneth, Greatstaff of Magna
--relic slots: Arcane, Frost, (initially locked) Arcane

Frost: (DPS)
--Ebonchill,  Greatstaff of Alodi
--relic slots: Frost, Arcane, (initially locked) Frost

Fire (DPS)
--Felo'melorn, sword, plus Heart of the Phoenix, held in off-hand
--relic slots: Fire, Arcane, (initially locked) Fire

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Notes from early on with the mage:

1. new Dalaran hearthstone
2. armor upgrades: considerable
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)