Magestone is an infamous awaken hacker group from CalFree. Their best known hack is wiping the result data from the CalFree gubernatorial election in 2046, which led to the events that made Los Angeles in to a free city.
Magestone specializes in making worm viruses. They used a worm to wipe the CalFree gubernatorial election of 2046, attacked Calablack Investments – a subsidiary of Shiawase – in 2063, and were responsible for the creation of the viral component of Jormungand.
Magestone is named after a mythical construct of the Matrix. The Magestone (not the group) is said to be a powerful crypto-key that can sleaze past any IC. It is possible that the "private can opener program" that Dunkelzahn bequested to Silvery K in his will was the Magestone.