I just passed through the blue mist and just ran straight through the battlefield (there was nothing that showed me the way, I just ran around til I found the way out) and after all the cut-scenes now I'm doing The Blood Curse quest. I need to get 3 objects. On my map there are two Quest Markings (!) on the entrance to the Dwarven Catacombs. I entered, killed eveything I could find and searched all the bodies. and nothing... the quest markings are still there. I'm standing right on top of them. What am I supposed to do?

The quest marker doesn't show you exactly where you have to go, just that you have to be in the catacombs.

Try going in and using Aard on some of the less stable-looking walls :)

Ever notice how some bits of wall look different to others?

There's a spirit hidden behind a breakable wall that's not near the other breakable walls. It should begin a dialogue. Have you gotten that yet?

Cool. Mark it solved. :)

And there is a guide through the battle field. It appears whenever you use your medallion.