You dont need any special or best DD to take Demon Wall down, just need people that know what they are doing. The dungeon drop ilvl60 items so I personally expect people to NOT be in AF doing it, at least have ilvl50 or ilvl55. WIth that you should be able to do it without any mayor problem. I can't wait for SE to put ilvlgear restriction to some content so people stop pretending to do everything in AF.