Uller
Adventurer
I'm going to need a marching order and any precautions you are taking against falling. The ledge right now is 10' wide but it will quickly drop to 5' or less. Derendil is a proficient climber ("In my current form...") and suggests those most likely to have trouble be tied to him so he can help them if they fall. You also could somehow tie ropes to the wall above you and use that to anchor you but that would make the going very slow.