| On the subject of traps my view is that there should be some routes in that have traps that cut you off from the exit but if there is a safe route in and the party finds it then as they make more and more repeat visits to the dungeon along this route then some of the intelligent tribal inhabitants will start defending the dungeon at the bottlenecks of this route and using traps to assist the defense.
Also of the party breach that defense and the tribe is still surviving they amy try again with a larger force and more elaborate traps. Esentially the dungeon as the Western Front. This could be what the forces the party to try another route that gets them cut off in the dungeon with no known way back. | 
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