The Violet Obelisks

The Violet Obelisks were five mile-tall obelisk shaped doomsday devices originally embedded underground in Karah. They are over 500 meters thick. Nomiku planted one on every major continent as a long term plan to escape the planet, but they went unused. They were accidentally activated by President Alka Kova in the late years of the Tethonen Republic, and then swiftly destroyed by an unknown band of vigilanteis.