Disaster / Destruction
The event that sunk Highrune to the seas.
In the years of BDJ (Before Diving Judgment) The Land of Highrune was a Perfect landmass of harmony, Made by the creator, king, and god of Earth, Adonis. But the land was filled with sin, and sorcery and wizardry, and they tried to tap into the power of the gods, stealing it from their realms of existence. The arcane mages tried to be gods on earth, even changing the name of the capital city of Highrune To "Adonis" mocking the gods. Seeing their hubris, Adonis himself punished the Infidels, and sunk the land into the ocean, taking with it all the sinful races such as Drows and those that live in the Underdark.