Traveling Sisterhood of the Eternal Bants
Myth Drannor, formerly known as (the city of) Cormanthor, the City of Song, was an elven city of around 10,000 in Cormanthor, which had been rebuilt after the original had laid in ruins since it fell in 714DR. At its height, it represented the peak of elven civilization and craftsmanship.
It fell to demons during the Weeping War and was in ruins, a dangerous place full of monsters and forgotten treasures, for many centuries, until reclaimed by Evermeet's Elven Crusade.
Prior to the reclamation, the elves kept the place hidden and sealed for the most part, and the city became a legend, one of the most dangerous adventuring sites in all of Faerun. The city became host to treasure seekers of many different races,and in the 14th century Dalereckoning, a cabal of Undead Mind Flayers manipulated the church of Bane into opening a portal to Avernus, the first layer opf the Seven Hells, causing a legion of Baatezu (devils) to pour forth. The portal was eventually closed, but around seventy of the devils remained.
In 1487 DR, after years of war against Netheril, the flying city of Thultanthar crashed into Myth Drannor, destroying both cities.