Descent of the Drow

Cultural event

Corellon's magic, as directed through his priests and High Mages, transforms the dark elves, whether the corrupt Ilythiiri or others, into the drow. Whether by magic or by the weaknesses that banish them from the sunlit lands, all drow retreat within two months' passing into the Underdark. Elves are summoned by the Seldarine to the site that becomes Elven Court one month after the Descent of the Drow, to settle differences and restore the peace among the elves. {Cormanthyr: Empire of Elves, p31}

In wildspace, the Drow retreat within asteroids and moonlets.