Alright so xer is found after saving Roushk in the corrupted lake, he ambushes you when you go after an egg "saying I've got you" then you talk and he tells you where to find him. You can only find his place in the underground minimap so you need a light source, plus the naked thing requires you to have met him once before the week countdown starts.
(Also you don't need to wait a week to visit naked you wait a week to talk about his path, meaning visit naked anytime lol)