Kuo Toa in Underdark

The way out of the Underdark lies in Western Tunnels.

Plot
A drow party is guarding the way to the surface (1108, 340), their leader will initiate talk with you:
 * If party isn’t under disguise of drow, the dialog will lead to a fight, then the only way out will be through Adalon’s quest, or kill her
 * If the party is covered by Adalon’s magic to look like drow, you may
 * Pay up 5000 to gain passage
 * Talking member with 16 cha may pay 1000 to pass
 * Talking member with 16 int can talk the way out

T1

 * Corrupted Tadpoles

Sources & references

 * Baldur's Gate II section at Mike's RPG Center