Spoiler: There seems to be a problem with the objectives in this mission. They're mixed up, but the mission still finished fine for me. The candles by the pool are not what you need to put out. You need to go back to the Mastisson crypt and look for a button hidden in the corner, sort of beside the shelf(at floor level, not on the ladder). That leads you to the correct area with the torches. You don't need the Ritual key to finish.
In Dreamslide, there is a tiny gold ring on the bottom of the pool. It's really hard to see.