The burning lights refer to the two torches in that passage; the wall between them is an illusion, leading to the secret passage. Close to the other end of the passage is another torch; like the graffiti says, make it dark...
I had my warrior approach the end of that passage with the gargoyles, with my archer to the south, ready to attack as soon as they showed up. You can come back when you are stronger, or even skip them, if you wish.
The key you will 'never find' is the one to get out of the maze, which you find later.
