Excalibur Sonic (エクスカリバーソニック Ekusukaribā Sonikku?), also written as Excalibur-Sonic, is a transformation that appears in Sonic and the Black Knight. It is the form assumed by Sonic the Hedgehog using the magic of the sacred swords, Caliburn included. He is playable in the final battle against the Dark Queen, an enhanced form of Merlina the Wizard.