The (a particle accelerator, a power plant, or the North Pole)
He realized the "roadside mystic" hadn't sold him a trinket; they had sold him a key. Now that he had unlocked the door to the Earth’s magnetosphere, something on the other side was pulling back. If you’d like to see where this leads, tell me: MAGNETIC BRACELETS
The (a rival magnet-user, a sentient field, or a government agency) The (a particle accelerator, a power plant, or
Deep in the city’s industrial district, a massive scrapyard crane groaned. Elias felt its magnetic field—a jagged, angry red in his mind’s eye. The crane began to swing, not toward a pile of junk, but toward him. The (a particle accelerator