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Earn at least Friendly reputation with the factions of the Broken Isles:
Court of Farondis
This quest starts and ends in Dalaran.
"There are a great number of factions here on the Broken Isles. We must unite them if we want to stand a chance against the Legion. Prove your worth to them and report back to me."
You will learn World Quests and will also receive Flight Master's Whistle.
Here you can buy Uniting the Isles Quest Boost for EU or US Servers.
You'll get guide for completing Uniting the Isles Quest Boost
Legion World Quests unlock