I have problems locating all the doors, how many are there? I found three in the hallway where the cyclop was and one that I needed to open to get out of the room where aratrok was, where is the other?

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the hallway where the cyclop was

Go back upstairs, where you killed the goblins. with a red pool and a blue pool at the sides. There, the doors in the corridors you're supposed to open. So you did, well that's it.