I can’t find it now, of course, but I was first introduced to the idea of the magical threshold and a monster that guarded it by a ritual I found on Witchvox when I was eighteen. I never did the ritual, of course. I wasn’t really doing magic back then, outside of my energy work and house wards and games of psychic tag. Hell, I don’t even remember anything about it except that it existed.
In the years since, I have encountered a number of variations on the idea, but I can’t really point to many of them because (until I started specifically researching them as I wrote this post) they were always incidental—either to the research I was doing, to the the article I was reading, or some combination of the two. The fact is that I dismissed them—incarnations of the Dweller on the Threshold, that is—believing them to be manifestations of a Christianized anti-magic worldview. The way I articulated that thought became more sophisticated over the years, but I never really re-evaluated that conclusion until recently.