As mentioned on the Scorn and the oldcity page.
Azuriner the Careful finally used the Golden Lance of Lythander (which was claimed by Mandor the Mad to be powerful enough to “Command to Those of the Skies”) to defeat the dragons and rebuilt Scorn - above the old one.
It is said that when Azuriner died, he was buried in the Old Scorn Below with his Golden Lance, and asked his sons to seal the doors to the world below, which was now “the domain of the past”. The key to open the deeper levels of the Old City was believed to have been sent back to Khelens, but no ships have crossed the High Ocean since the end of the Flame Wars, nearly 5000 years ago.