It's other magical ability is that it can move itself a little bit, that's more so that he can mess with anyone wielding him against his will though. He is also stronger then a normal sword. Also he has a face, so if he's being held properly he can only see what's to the side. And, everyone can hear him.
[hider=Face covered up][img=http://images2.wikia.nocookie.net/__cb20090321013955/sonic/images/1/18/0087_sonic_and_the_black_knight.png][/hider]
[hider=Face exposed][img=http://images3.wikia.nocookie.net/__cb20111114063124/sonic/images/2/21/Sonic_and_the_Black_Knight_13_Caliburn.png][/hider]

And yes, he will be annoying