I have been playing this game with my 7 year old son, and we are trying to complete all of the adventures. We are stuck near the end of the "Well of Souls", after making it through the coffin room. We translated the hieroglyphs and got the treasure, as well as cleared the spikes to get the the back of the room, but I can't figure out how to complete the room. What is that gold cylinder thing at the back of the spikes?? Any suggestions or help is appreciated!

Thanks in advance,