Again still don't see this working out. A dungeon who's progress solely relies on the use of a DoL class is a no go. If a node was to be needed to clear an area it would just be like all the rest found already in the game. Blow it up with items or destroy it with spells. Yes sure this game end game is not geared toward crafters, but honestly making them limited is the correct way. A crafter class and subsequently the DoL classes that support such are ment to support you until a certain point. After that level then it becomes not needed and your main adventuring class become important. If you wanted a DoL/DoH then there are other games that will do just that.