You do not have to take the quest in Dalaran to start farming for a new legendary upgrade every time. This is now a currency which you will find in the tab next to your character slot.
Reaching 50 Writhing Essences will allow you to upgrade a legendary by talking to blacksmith trainer in Dalaran. You will trade in 50 Writhing Essences for an item that lets you upgrade any of your Legendaries to 970.
Here are the different ways to farm:
- Weekly mythic plus chest (20)
When completing a mythic plus (no matter difficulty), you will get a weekly chest in your Class Order Hall. This will contain 20 Writhing Essences. You will not get any Writhing Essences from chests inside m+ dungeons.
- Emissary quest (4-7)
Each day, there will be a new Emissary quest for a certain zone in Broken Shore. This quest wants you to complete 4 quests (3 for Kirin Tor), for that emissary faction.
Completing this, rewards a chest (cache) that contains between 5 to 7 Writhing Essences.
You will not get any Writhing Essences from war supply caches in Broken Shore.
- Daily Heroic Dungeon (5)
Opening the group finder will let you que up for a random heroic dungeon. The first time you complete that during a day, will reward you 5 Writhing Essences. You will not get Writhing Essences after the first daily random dungeon.
- Tomb of Sargeras Raid bosses (2-5/boss)
Killing bosses in the new Raid: Tomb of Sargeras will reward 2 Writhing Essences per boss you kill. You will not get more if you kill sam boss in different difficulites. Raid Finder is not out yet and will be updated once first wing comes out next week.
- Weekly PvP 2v2 (7)
Earning 1500 Honor when doing 2v2 arena will reward you with 7 Writhing Essences. This can be done only once per week.
- Weekly PvP 3v3 (7)
Earning 1500 Honor when doing 3v3 arena will reward you with 7 Writhing Essences. This can be done only once per week.
- Weekly PvP Rated Battleground (7)
Earning 1500 Honor when doing Rated Battleground will reward you with 7 Writhing Essences. This can be done only once per week.
The MAXIMUM amount of Writhing Essences, assuming you are lucky and get max Essences from every source (which is highly unlikely) is 150.
You do NOT get Writhing Essences from Raid Finder (ToS raid Finder not confirmed yet)
You do NOT get Writhing Essences from invasion reward.
You do NOT get Writhing Essences from War supply caches
You do NOT get Writhing Essences from reputation caches.
You do NOT get Writhing Essences from any previous raid bosses (only ToS).
You do NOT get Writhing Essences from mythic plus chests (only weekly).
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