There is a quest in the “Conclave of Three” in which you have to decide the fate of 3 novices in the service of Solael, if you let them stay you can ask the leader of the novices about why are they in that place, and he tells you about the story that his great-grandmother told to his grandmother, which she told him, about how beautiful Korvan city was and its fall, the story was told as if the great-grandmother witnessed the fall of Korvan, which means the great-grandmother lived in Korvan, and being she a “great-grandmother” that means like 150-130 years ago.
And now the problem with the novice story:
A) First we have the Ulzuin devotion, Ulzuin was a Korvan god, an ascended god in charge of protecting the portal to the Eldritch plane and ceremonies in service of Korvaak, that until Bysmiel “betrayed” him. But Ulzuin’s devotion speaks about that betrayal, saying it happened “millenia” ago, that is more than a thousand years…
B) Second we have a similar issue with the Scribe Osteram’s Notes you can find in the “Shrine of the Forgotten God” (Gryver’s Mill), the note says that the language carved in the forgotten god statue has been dead for over a thousand years.
So… When did Korvan fell? 150 years ago or more than a thousand years ago?