As I mentioned in the chat, I don't really have any issues style-wise, but I feel like this is merely an above-averagely detailed Monster Manual entry. The note at the end is an attempt to counteract that, however it's managed to pack in an asston of cliches in a small space ("Foundation found this for some completely ridiculous reason", "vanished spooky creator leaves threatening note explaining his anomaly", "note pinned threateningly to the wall in threatening manner", etc.) without giving us anything of any real substance.
It's not terrible, and it probably would have flown in the early days of the site, but I need something more from an article in today's environment. -1.