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Found the quest by accident in front of a delve (not spoiling it for you adventurers) As it's a prologue, wasn't it supposed to appear on the Crown Store? I may be going blind, but I swear I could not find it there.
In the past few years, I've definitely done prologue quests and had people saying it's not even supposed to be out yet. Isn't that odd. It is like they are leaked on purpose before being officially announced.
I did not see this quest being announced, true. That is why I was so surprised to find it in the wilderness outside a delve! Then I went to the Crown Store to see if it was showing there (and it wasn't) so I'm not sure if it's a bug or feature.
Found another thread on the subject, with some intereeting insights and questions but it's in a less visited part of the forums:
south of the Abamath wayshrine in Malabal Tor, near the entrance to Shael Ruins
Read the bug report, the location is probably faction dependent.
I tested and got the quest with AD, DC, and EP characters off that same location. Further along the quest, with non-AD characters, you'll be sent to other spots.