Im down in the temple sewers. I heard rumor that I need a key from somwhere to move on to the quest is this right? If so where? and how?
Thanks!

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Go all the way to the top left corner of the sewers. You
will find the entrance to the Cult there. When you enter the
cult's domain, take your first left and follow it around until
you run into Gaal. He is the one that gives you the key.