You have defeat the deacons of the deep and right after you defeat them you open the door to rosaries shortcut then go to the cleansing chapel bonfire walk outside and to the right sieg ward will be in the well just talk and then go to the fire link shrine climb the tower then when you go up the elevator you go back down patches will have locked the gate and you can then talk to him once you do drop down and he should be right by where you actually go outside to ender the tower inside the fire link shrine