The sword was born of the old magic. You have no idea of its power.Kilgharrah to Merlin about Excalibur Excalibur is the finest sword ever crafted by Tom the blacksmith. It was burnished in Kilgharrah's fiery breath at Merlin's request, imbuing it with the power to kill anything, mortal or magical, living or dead. Though Merlin promised Kilgharrah that Excalibur would be wielded by Arthur alone, he failed to prevent Uther from using it and was forced to hide the sword where no mortal man would e