I need the key to the above mentioned maze, i was told that it was in "Clerks ward" bt exactky where is it? Thanx

A drop of her blood is the key to Ravel's maze. You can get it from Kessai Saris (I think it's her) after you learn that she's her daughter.
You'll have to do a bunch of quests in the Brothel before she'll reveal that secret if I remember right.