The central cathedral of Lordran, originally home to Gwyn the First Lord. Now it is occupied by a more horrific entity, Aldrich, Devourer of Gods. To reach Anor Londo from Irithyll of the Boreal Valley, you need to enter the Darkmoon chamber and head to the left, pulling a lever to bring down the rotating tower.
- Found on the remains of the Giant blacksmith, on the left-hand side of the cathedral from the Anor Londo bonfire.
Anri of Astora's summon sign is on the left of the double doors to the entrance if you've completed his/her questline thus far. Look for the prism stone.
Sub-zone of Irithyll of the Boreal Valley