Actually there is a Dwarven Sapper class of sorts, it's a thief subkit you can find in the AD&D Rogue's Handbook.
They loose 3 points from both int and wis due to the brain damage caused by inhaling toxic chemicals, and, IIRC every 2 levels gained they get a new trap or device. However, no matter how skilled they are, there is always a 10% chance of failure when laying a trap, meaning that the whole party could be in danger.
Also, in a very dire situation, they have the option to detonate themselves, killing everything around them. No saves. They can not be raised from the dead if this happens, as there is no body left to raise.
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