Keep thinking of Jonelias and turning up the gothic elements to x1000 than they already are in canon, and somehow it always ends up in my mind with Jonah still having his Scottish family house/manor, and getting Jon there, and then Shenanigans.
In my head, it’s mid-season 2, Jon’s off rails, in a beautiful way, for sure, but Elias has also had a lot of thoughts on his side ever since he hesitated, watching Jon getting eaten by worms, pulling the trigger early. So it’s almost a test for himself and for his Archivist when as “punishment” for Jon’s behaviour, he tells him he’s sending him on a very specific mission in Scotland, to Jonah Magnus’s old house, to gather and archive the documents there as the Institute is thinking of turning it into a museum or an extended branch or something.
Jon, of course, is furious (and secretly relieved, for a brief moment, because the paranoia DOES tend to lessen whenever he’s away for a bit of the Institute
and his coworkers, coughnot!sashacough) but it’s not like he’s got much choice, beyond quitting or being fired, and when he asks if his assistants are coming with Elias is like “don’t be ridiculous, Jon, they need to take care of things here and you’ll agree with me you all need some time apart. You’ll do a reconnaissance of the house and its content, as it is, and I’ll join you myself in a week or two. You should have all amenities available there, excepted perhaps the Internet - but phone service should be fine, so we’ll be able to keep in touch if you need anything.”And then he gets into the house, so quiet, so old, but kept in order, clearly; the phone service is actually terrible; the bed he sleeps in (“Jonah’s bedroom,” Elias tells him when he does manage to call him) is comfortable, but the room is often cold; and here, as well, just like in the Archives, he keeps being WATCHED. And it’s not the only odd thing that happens - that one he’s almost used to, now. But it’s the letters; the weird objects; the noises at night; the old fashioned clothes filling the wardrobe one morning instead of his own clothes; the way his car won’t start after four days; etc. etc.
(Something something something, breathing life into another of Jonah’s attempt of living beyond death, getting a nostalgic shade of the monster who already loves him and sent him here for judgement, and who decides that Jon would, in fact, make for a proper spouse,,)