Greysteel Incursion on Ust Natha

Ust Natha has long held superiority over their neighbors in the Underdark. However, in the year 1095 DR (by the surfacer's calendars) Ust Natha was wracked with infighting after a failed insurrection by several of the Great Houses. House Do'virr and its supporters had the better of their rebel foes, but the Duergar to the north boldly seized the moment of weakness to strike at the Drow...