Force stonestorm was a powerful Force power capable of ripping apart an entire planet. It was discovered during the force war on Quary. After destroying the planet's surface. It was forbidden by the Jedi Order on Urum but one Jedi didn't obey this command. This Jedi made a deal with his Apprentice that if he´d teach him the power the Apprentice would teach it to his apprentice and so on. It was a risky way for the power to stay known but it worked.