Excalibur Sonic (エクスカリバーソニック Ekusukaribā Sonikku), also formatted Excalibur-Sonic, is a transformation that appears in the Sonic the Hedgehog series. It is the form Sonic the Hedgehog can achieve with the magic of the four sacred swords, Caliburn included. During his battle with the Dark Queen, Sonic achieved this form with the aid of the Knights of the Round Table while Caliburn became Excalibur, thus giving the duo the strength needed to defeat the Dark Queen and save the world of Camelot.