Tales of Tolgard
A dungeon delver is an adventurer who trains him or her self to be able to survive in dungeons. They are not satisfied with just traversing a dungeon, they have to learn everything about the dungeon as well as looking forward to the next dungeon they can delve into.
The profession is relatively difficult to get into because it involves giving up a lot of what normal adventurers cannot depart with like gathering of fame. A dungeon delver thinks in terms of what can I take with me. Delvers have been known to do everything down to taking the doors off the hinges and taking them back to town to sell.