The purpose, from a gameplay perspective, is a failsafe to prevent people from getting permanently stuck. Since the game autosaves over every tiny thing, if you somehow glitched into somewhere that you can't get out of, and have no way to warp to a bonfire, nor any way to kill yourself, well, you'd be trapped, end of character. That is like, the root gameplay reason to include such an item.
I do recall it being possible to get stuck in Great Hollow like that, too, though it may have been fixed.
i highly doubt its possible to get stuck in places. theres always a way to kill yourself. ledge, enemy using range attacks.
but yea, darksign is basically the suicide button.
It is possible to get stuck in some places.
PSN: GSPhantom But really, it's a battlefield! How do you compassionately stab someone?
Sometimes I wonder if there is a secret Illusionary wall that we don't know about, how would you know if we know them all? Have you hit every single wall in every single area of the game?
I actually started a character to do this, but I got bored by the time I got to the gargoyles lol. It would be insane if someone actually hit every single piece of wall in the game. I'm insane for getting to the church hitting every wall.