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Loki is an elder vampire who wasn’t even human before being bitten. He has a long history of antagonism against some old gods. A recent epic scuffle with them in mid-town Manhattan caused an awful lot of property damage and a few civilian deaths, and got the attention of some highly-paid hunters, part of their own global organization which keeps track of things supernatural, extraterrestrial, et cetera. Tony Stark is their engineering genius and sometimes a heavily armored battering ram with rocket boots when things get really ugly on the extraterrestrial front, and normally he doesn’t truck with the more magic-y bullshit, but after meeting a couple of actual gods from Asgard, and finding out they’re aliens... he gets curious.
Tony Stark goes looking for trouble. Trouble, in the form of an elder vampire curiously antagonistic toward Asgard at every possible opportunity in history that they made contact with earth, finds him. Trouble always loves Tony, but this trouble has plans. And a secret lair. And Tony wakes up suspended from the air and chained. It only gets stranger from there.
- Part 18 of Pernicious Prompting