Can't fin the prison / founder ford

[[GoT] Xistence]

I am grinding at Yeasha for days, looking everywhere but I can not find founder ford.
I have been looking everywhere. I got a dungoen with a lot of riflemen and the dungoen at the treehouses. I killed The Warden, Scald and Sear and the totem father.

[Shrimp]

I'm pretty sure he's campaign exclusive.

[Choc goblin]

If you fought Totem Father, the exit should be in that bosses arena. As you come though the fog door (or where it used to be, since you killed him), turn right and follow the edge of the arena until you find stairs leading down.

[Cleo]

‘The entrance to the prison is a door to the right of the main entrance (the walkway you came in on). There are two white lamps on either side of the prison’s entrance, It’s easy to miss because it’s dark.