Menzoberranzan Alternate Route
The standard patrol consists of two drow scouts mounted on giant riding lizards (use the statistics at the end of chapter 8). Characters who can see out to a range of 120 or more and are moving at a normal pace spot the drow scouts with a successful DC 16 Wisdom (Perception) check. If the characters are moving at a fast pace, they take a −5 penalty to their checks.
Unless the characters are moving at a slow pace and being stealthy, the drow spot them with their darkvision and withdraw to an outpost located a mile away. Defending the drow outpost are a female drow elite warrior (the commander), a male drow mage, and sixteen drow. The outpost is a four-story tower carved out of a 60-foot-tall, 15-foot-wide column in the middle of a 75-foot-diameter cavern. Both the cavern and the outpost are unlit. A secret door in the column’s base leads to the tower interior, but finding it requires a thorough search and a successful DC 20 Wisdom (Perception) check. Arrow slits on each floor allow the drow to cast spells and make ranged attacks in every direction while enjoying three-quarters cover against attacks from the cavern.
If the drow scouts escape and the characters don’t follow them, the scouts report to the outpost commander, who organizes a hunting party consisting of her and eight drow (leaving the mage and eight drow to staff the outpost). Use the drow pursuit rules in chapter 2, and assume a pursuit level of 4.