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Reach Archdragon Peak.

After the Dancer of Boreal Valley fight head up the ladder and then left to the stairs, head down and kill the knight to get to the Consumed Garden fight through here and kill the Consumed King boss. In the room just past him you find the Path of the Dragon gesture. Now you need to head to Irithyll Dungeon.

Warp to the Profaned Capital bonfire and down the ladder, go up the ladder at the other side and across the stone bridge (minding the gargoyle) then up the ramp here to the Dungeon. You come to the room that is full of jailers (where Karla was) so kill them or rush past them to the door on the far side of where you entered. Go in here and head up to the dragon statue. Stand on the carpet next to it and perform the Path of the Dragon gesture you just found to be transported to Archdragon Peak.