The Ray Field Inhibitor, often abbreviated as the RFI, was a device created by Dr. Sebastian Wolfe, as a counter-measure to the Ray Field Plague. The device, as its name suggests, inhibits Ray Field Energy, functioning like an anti-Ray Sphere. Wolfe also discovered that the inhibition of the energy could possibly weaken or kill Conduits, thought of using it against entity that Kessler warned his associates about. The Ray Field Inhibitor could remove the superhuman abilities of all Conduits, though it resulted in their deaths.