Up by where you meet the Dwarves (or whatever they are)...kind north and west on your map, if you check the boarders there should be the symbol that let's you leave maps..I believe that's where the koa-toa dungeon is...Yes there is a way to get out if you kill the dragon...Check the walk-through
*possible spoiler*
.
.
.
.
.
.
.
.
.
they are one in the same, at the end of the kuo toa dungeon is the exit from the underdark, but i don't know where that is since i have just returned the eggs to the dragon and cleared out the kuo toa dungeon in reverse.
------------------
Every normal man must be tempted at times to spit on his hands, hoist the black flag, and start slitting throats.
-H.L. Mencken
Every normal man must be tempted at times to spit on his hands, hoist the black flag, and start slitting throats.
-H.L. Mencken