RockRage is the biggest known rock monster.  He is the king of the Sulfurix. Although his real name is RockRage, he actually prefers to be called 'Crystal King'. He is very destructive and likes to wreck a lot of the Power Miners' vehicles. A magazine says he was woken up after a long sleep by the noise of the titanium command rigs drill and caused the Power Miners to fall to the earths core (information from Lego Club Magazine).