what does a follower of Bezaben have to do?

The Land of Chup has fallen under the power of the “Mystery of Bezaban,...a Cult of Dumbness or Muteness.” In this cult, Khattam-Shud declares hatred against stories. Now he “opposes Speech for any reason at all.” There are members of the Mystery that sew their lips together and they die of hunger and thirst as sacrifices to Bezaban. Rashid explains that Bezaban is a giant idol made of ice. It is in Khattam-Shud’s palace. It is a frightful idol.