...at a specific location, namely -and I have no idea whether the spoiler tags will work here-
[spoiler]just before or after the corridor on the Shore, that will collapse after you pass it, when you go to the final battle[/spoiler]
Maybe it is already therr; the Devs said they had made some adjustments to that particular part of the game. I'm presently doing my second play of this unprecedentedly great game, so I'll see.