Calibur!

Do you know the difference between Excalibur and Calibur? It's simple: Calibur is the sword embedded in the stone; whoever pulled it out would become king of Britain. During a fight, the sword broke, which led Arthur to search for the true legendary sword. Calibur is also called the "stone sword," "proto-Excalibur," or simply Excalibur (there are several variations of the legend...).