what does the lever in the refectory do

According to the search results, there is a lever in the Refectory in Baldurs Gate 3 that can be used to open a door. The lever is located in a room with a skull lever, and pulling it will open the previous door that you passed. However, there are also other ways to open the Refectory door, depending on which side you are on. One way is to light up the Iron Candelabrums in the library of the Refectory and pull the lever behind. Another way is to find a secret switch hidden on the wall near a large statue in the south of the Refectory and press it to activate the door.