The book contains a clue of what to expect next, part of which is something like 'in a row, like the water flow...'. Water flows from high ground to low. The 6 levers in the next room are all at different heights.....

<span class='standouttext'>Spoiler : </span><span class='spoiler'>Pull the levers from high to low, and you will avoid the gargoyles and golem, and open a small cellar with a bit of treasure.</span> (highlight the text to read)