After completing the 8.1.5 Heart of Azeroth questline, players will get a visit by a Messenger of the Speaker: an Earthen Guardian. For the Horde, he is located at the Grand Bazaar (near the Port of Zandalar flightmaster).

He provides the quest titled Return to the Heart. This grants access to the Heart Forge.

Learn more about the Heart Forge’s Essences in our transcript of the 8.2 Rise of Azshara Content Preview Livestream by game designer Jeremy Feasel (Muffinus).

ALL MECHAGON CONTENT NAVIGATION
1. Jeremy Feasel: Mechagon2. Mechagon Questline Videos3. Pascal-K1N6 & Quartermaster4. Mechanocat Mount
5. Summoned Rare Elites6. Mechagon Rare Elites Map7. Gift of the Dragonflights8. Construction Projects Map
NAZJATAR
1. Nazjatar Questline Videos2. Nazjatar Rare Elites Map3. Nazjatar Battle Pets Map4. Nazjatar World Quests
5. Severely Rusted Lockbox
HEART FORGE
1. Return To The Heart

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BlizzCon 2019 Panel Transcripts