The Dark Dominion
You rolled a : 10 and got :A Drow Patrol
The characters encounter a patrol consisting of 2d4 (5) drow led by a drow elite warrior. The patrol stops and questions any non-drow who aren’t slaves, as well as drow they deem suspicious. It might take roleplaying or a successful DC 15 Wisdom (Deception or Persuasion) check to convince the patrol not to attack the party. If Grin Ousstyl is with the party, he quietly suggests that the characters offer the drow a bribe of at least 50 gp. If they do, the characters gain advantage on checks made to talk their way past the patrol.
Any sign of a large, armed, and potentially hostile group causes the patrol to retreat and seek reinforcements. If the characters remain in the area, the patrol returns with two additional patrols 1d10 minutes later.