I've been to the bandit camp and blew my cover because I had no idea what I was doing. I've also been to Seliavrelleis and met a ghost who told me about flooding. I guess the next step is the house on the hilltop. The thing is, I don't know where the key is - or rather, I do know because I looked it up in the CS but I don't know how to get there. On the first level of Seliavrelleis, there is a secret room, but I can't find a switch to open the walls. I've also found a blue and red Ayleid key crystal but no place to use them. There are two places to proceed, but they're blocked by shimmering barriers. I've also explored the ruin up on the hill, Lyeseli, but didn't find anything there except an abandoned tent with an old journal.

So...what do I do next?