Lifeblood

Eight years ago, a man found himself smouldering in a crater, a few miles away from the nearest city, with no recollection of his own past. After so much time had passed and he had finally thought he had found a life worth living, he found it all snatched away by a single terrible accident, but not in the way one would expect - an intensive surgery revealed his heart was wrought in iron, the same way that gods were according to ancient legend.

He was immortal, and the wounds that should have killed him instead healed in a day.

Now he has been locked up by the city's authorities and been forced to endure experiment after experiment in a twisted version of hell he could not escape. But now the devil is sitting before him, and she's willing to make a deal...