Sorry if I misremember the name, it's the cavern after the raven boss that leads to Mosswood.
I was very confused by this cavern because I simply could not (still can't tbh even when I'm past it) understand where to go, or how.
So I thought 'there are plateforms with a light, so surely I want to glyde to this one, and the next one with light, and then this one with light on too, and so on'.
But apparently it is not the path?
So I ended up on a plateform near the entrance with no other path but to go further down into the bottom pit of the cavern. Onto unlit tiny plateforms. The first 10 times dying (and yelling at it) I could get to my grave no problem, but that grave was always on that one plateform with light that can only lead me further down into gameover. After many more deaths the grave is now so far down that if I dare try get to it the fox doesn't even have time to reach that tiny plateform that he's already dead (it was quite gruesome at some point with all his limbs going all floppy and dragging along a rock ;_;).
I had 350 crystals that I earned from the pots given after the raven fights, and I thought there was only one path that was leading to the cavern with no option to go back to my den and store my crystals. Seeing how much time it takes to usually earn crystals and the price of items in the shop, I had to rage quit after an hour of trying to get to this grave.
To add on top of that, waypoints were working just fine until probably the 20th death. Now they barely work at all. I add a waypoint, it shows on the map in the menu, I exit the menu: nothing. I go back to the map: waypoint had been removed. Even once past the Cavern and in Mosswood (and me raging that obviously I have no crystals left so I can't activate the Obelisk because of that one gameover-inducing grave) it still does it: sometimes it works, sometimes it removes it. I can't pintpoint what is causing them to be removed on their own.