From Blizzard's Support Article:
To unlock Zereth Mortis, you must have completed Chapter 2 of the 9.1 campaign, Maw Walkers, up until the quest Charge of the Covenants. After that quest is completed, you will receive the pop-up to start the Zereth Mortis campaign.
Last Update: 2024-01-09 23:43:37 (Patch 10.2)
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