In front of a large assembly of Earth's heroes, Blue Beetle created the eggs, which Lex Luthor then laced with a virus by connecting it to a flash drive. The virus was devised by LexCorp to disable Reach technology, as part of the Light's plan to betray the Reach. Lex briefed the heroes that the Magnetic Field Disruptors—doomsday devices planted by a vengeful Black Beetle—would be deactivated by simply touching the egg to the device.
An MFD belatedly discovered in the Arctic entered into its chrysalis mode by the time the Flash and Impulse reached the site. Lex advised them that the egg would no longer be effective. It took the dedication of both speedsters, and the sacrifice of Wally West, to save the Earth from the magnetic storm caused by the chrysalis.