There are a few traps here: one in front of a ballista near the start that seem undetectable and undisarmable and sadly trigger multiple times. I set it off four times in rapid sessesion and my sorc nearly died right there. Also there appears to be no way around the trap as we kept trying.
Ettercap Quest
With v1.67 we are planning on getting an awesome new dynamic trap system, so the issues involved here should disappear shortly. I don't know whether this specific issue has been fixed.