This covenant is 7th you can join in this game. It is located at the Pontiff Sulyvahn bonfire in the Irithyll of the Boreal Valley. Kill the Pontiff Sulyvahn boss and go out the building. Turn to the left and move to the yard where some dead giants are sitting on the ground. Cross this area and run up the stairs to enter the tower. You have to destroy the illusion wall on the left part of the room but you mustn’t go up the other stairs. To find the ladder you have to hit this wall. Go down and cross the huge hall with 2 big monsters. You will find the sitting puppet in the left remote corner. To join the covenant you have to pray it.