In a medieval world, the protagonist has a suit of armor that draws off of his body heat to produce a weak electromagnetic shield that repels against attacks from metal weapons. I don't feel comfortable hand-waving this to such an extreme.
I need at least a plausible explanation as to how he obtained such a ridiculously advanced piece of technology (probably tech of about 200 years in the future) came to be possesed by a person in the times of catapults and swords.
Some possible explanations that allow for such technology:
- Time travel- I don't really want to use this one, but I will resort to it as a last effort.
- An advanced civilization fallen to ruin by some apocalypse, think Thundarr the barbarian.
Are there any more explanations that would be more fitting for the situation?