Disaster / Destruction
After the Fourth Crown War, the surface elves begged Correllon to do something about the constant conflict and wars with the dark elf Kingdom of Ilythiir. The elves' plea were answered by −10,000 DR. Corellon's magic changed the dark elves into drow. Over the course of two months, weakness against sunlight and/or the efforts of the other elven nations drove them into the Underdark and the mighty surface kingdom of Ilythiir collapsed.