I've also just started this #Fanfic recently. It's a bit Cthulhu-ish, steeped in the Eldritch. But if you like that sort of thing ...
John Blackwood, an American special forces operative is sent to Hogwarts under the guise of a Muggle Studies professor. But his true mission lies deeper: prepare Harry Potter for a war beyond prophecy—one not just against Voldemort, but against the cosmic horrors the Dark Lord has awakened in his obsession with immortality.
An American Yankee in Dumbledore's Court
By: Pynrieg
fanfiction.net/s/13079527/1/A-…