Sometimes, success can come from failure. And while it is too soon to mark this story down as a success, it will hopefully start out better than its original form.

You see, I wanted to do yet another Harry Potter and Fate/Zero crossover, which was pretty insane. I wanted to do a story where Medea is summoned by Harry during the events of Fate/Zero. But the more I looked at it, the more I realised that the spark wasn't there. I wasn't writing the interactions between Harry and Medea right, which given that I wanted to ship them, was turning out disastrous. And there's only so many ways I could have Harry end up in the Nasuverse. Indeed, it was coming out as a second-rate rehash in many regards of Ex Umbra in Solem, despite Harry not being the Master of Death in the original version of this story.

But inspiration strikes at the oddest times. I haven't done any fics, as of writing this foreword, from the Marvel Cinematic Universe. But that would change. I realised that Medea and Loki are very much alike in many regards, and as there didn't seem to be any marked crossovers between Thor and Fate/Stay Night to date, I thought, in the interests of being groundbreaking (I have done some firsts on this website in terms of crossovers: Black Mage of Kuoh and Anchor of Ultimecia are the most successful, though I have soft spots for Quatermass and the Doctor and L for Luna, both crossovers with old TV science fiction serials, namely the Quatermass serials where I get my name, and A for Andromeda), I would be the first to do so. Imagine the chaos Loki will inflict on the Nasuverse.

The title, incidentally, was originally intended for a different one, a crossover between Harry Potter and Fate/Stay Night. You can see the original story with this title in The Cauldron, or at least the first two chapters. It's a reference to a warning they used to have on fireworks: Light the blue touch paper and retire immediately.

Anyway, time for the usual disclaimers. Firstly, there will be spoilers for both Thor 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. Thor and Fate/Zero are the properties of their respective owners. Please support the official release. Otherwise, Gilgamesh will turn you into mince with his Gate of Babylon…