Go through the originally locked door in Oedon Chapel (on the right when coming from the lamp).
Unlocks when you defeat Blood-starved Beast in Old Yharnam's Church of the Good Chalice.
Oedon Chapel walkways
There's an opening in the wall halfway up the elevator shaft. Run/roll through it as you ascend/descend.
Formless Oedon (+4)
Communion (+1)
Go around the left side of the tower.
Lower tower: Abandoned Old Workshop
Make your way into the lower tower â the dark pit with the wood beams and platforms. At the very entrance, there is a short, broken off beam coming out of the left side of the platform going towards the center of the pit. You must drop down at the spot between that beam and the edge of the platform that's built along the wall. You will land on a wooden beam, from which you should be able to see another platform below you, with the door leading to the workshop. Make sure you have enough health to survive the long drops.
Abandoned Old Workshop
Give Small Hair Ornament to Doll