Gah, once more, I'm showing off my insanity by starting a third crossover between Harry Potter and the Fate franchise. And like Perils of Magical Investigative Journalism, it's with Fate/Stay Night. But hear me out, okay?

After writing both Perils of Magical Investigative Journalism and Ex Umbra in Solem, which have become two of my most popular works ever, I realised that those two were deficient in some areas, something a few people have pointed out in reviews, some more kindly than others. The former work has a know-it-all Luna as a Macguffin in the form of a character, and is somewhat cracky, while the latter has a Master of Death Harry who is bitter and cynical, and has a touch too much righteousness for a couple of would-be readers. I also realised, I wanted to ship Harry with Rider/Medusa, and while I had done a little of that in Perils of Magical Investigative Journalism, I wanted it to be somewhat stronger.

Gorgon and Thanatos then, I hope, is an attempt to make a stronger crossover, with less crack and, while still dark, not overly so. Harry has a reputation, but he's not immortal. Well, unless he has a Reality Marble. I have to admit, I was heavily inspired by Gabriel Herrol's Everything for My Family challenge, but the original posted version of this story in The Cauldron, where he becomes a big brother figure to Illya, eventually lost my interest, partly because I did another fic that was closer to that challenge, albeit as a crossover with Final Fantasy IX: namely Kuja von Einzbern.

Anyway, time for the usual disclaimers. Firstly, there will be spoilers for both Harry Potter and Fate/Zero.

Secondly, there will be heavy annotations, as is usual for my works. You have been warned.

Thirdly, this is an M-Rated work. There will be coarse language, violence, and sexual references. Again, you have been warned.

Finally, the following is a fan-written work. Harry Potter and Fate/Zero are the properties of their respective owners. Please support the official release. Otherwise, Medusa will petrify you…