How to reach Archdragon Peak? Dark Souls III Guide
Last update: 01 June 2016
To reach Archdragon Peak, you will have to go to a different location - Consumed King's Garden and slay Oceiros. Do it, and a door behind the bonfire will be unlocked. Enter a narrow corridor. At the end of the chamber, there is a body with Path of the Dragon gesture.
Once you have the gesture, head back to Irithyll Dungeon. Go to a chamber presented in the screenshot, where you will encounter a group of guardians. Avoid the middle of the room and turn left, then head upstairs.
Search the fallen knight for Dragon Torso Stone, and head to the lift. Draw attention to a Dragon Statue on your left. Approach it and use Path of the Dragon gesture. Wait a moment for a cut scene. You will be transported to a new location once it is over.