Hardest Dungeon?

[Canadane]

StB - Bardam’s Mettle or The Burn
Bardam’s difficulties mainly comes from wall pulls. It’s merely a shadow of its past glory at this point but it can still get spicy when one or two players are playing sloppily.

I dunno what Stadowbringers is but yeah the last boss of The Burn still likes to give me trouble. I think it's just that many dungeon bosses have room for error while this one if you slip up at the wrong time will make it very difficult to recover from without a wipe.