he spawns at /way -816, 606, 38. you can just stand in the room and let the ghosts auto agro but i had better luck standing outside. theres a message win you walk in the room about the resurrectionists and a message win you kill them. i cant say for sure if they have any affect on the ghost spawns or not but on day 1 in the room ghost spawns were really inconsistent. they are indeferent but assist the ghosts so end up dead if your in the room. i saw plenty of ghosts spawns wile they were dead. day 2 standing in the next room they were more consistent and i got him after 3 hours.
what i did both days is wipe out most of the zone killing any ghosts i found and anything else that got in the way. then stood in the room on day 1 just outside on day 2. i needed him and 1 other ghost and go them both on the same spawn. befor i could kill the first and alt tab my box was being attacked by the other one.