Ok i blew my cover in the drow city and the only option left is to kill adalon...she has the scroll to open up the doors to surface... but where is the place i need to use the scroll? if anyone ever chose this path please help me

In the Kuo-toa Dungeon. It is in a western area in underdark, unlisted in the map. A pain in the rear, u goota move your mouse around a bit to find it.