I've finished the main quest after defending Blackmyre, and gotten the notification that the Hallowed Cave has been added to my map, but I cannot for the life of me find it.

I've also seen things online about a grave that you can get a legendary item from, but nothing about where it is.

I've already been to the Abandoned Oasis and obtained the gauntlets (and even the secret Torch item outside the cave that I've seen nobody mention!) as well as the legendary shield from the Nordenfjoror dungeon.

Does anyone know where I can find the cave and the grave, as well as any other cool spots/items?