Magnetic Bracelets -

The (a rival magnet-user, a sentient field, or a government agency)

The (a particle accelerator, a power plant, or the North Pole) MAGNETIC BRACELETS

As the machine’s magnets ramped up, the bracelet didn't just pull; it vibrated with a frequency that bypassed his skin and resonated in his marrow. A blinding flash of violet light filled his vision. When the technician pulled the bed out, the room was empty. The (a rival magnet-user, a sentient field, or