The Ultimate Weapon was created by the Daleks. They would use the Crystal of All Power to power the Ultimate Weapon in order to control all life in the universe. (AUDIO: Seven Keys to Doomsday [+]Terrance Dicks, adapted from Doctor Who and the Daleks in Seven Keys to Doomsday (Terrance Dicks), The Stageplays (Big Finish Productions, 2008).)