From publisher blurb: The drow elf entry in the Monster Manual lists four types of drow: the standard drow (CR 1/4), the elite warrior (CR 5), the mage (CR 7), and the priestess of Lolth (CR 8). This document provides a range of other drow to populate any Underdark encounter, adventure, or campaign. The creatures here range from CR 1/2 to CR 7.