The Case of the Black Knight: The King, the Sorceress and Caliburn

The sorceress Merlina to defeat King Arthur, who has been corrupted by dark powers, decides to invoke a hero from a different world.

Merlina, instead of getting a certain blue hedgehog, invokes Bruce Belmont, a descendant of Morgan Le Fay, who owns Class Cards, including Mordred's card.

Bruce will help Merlina overthrow King Arthur and defeat the Knights of the Round Table, but he will do it according to his own methods.

Merlina got the best opponent for King Arthur but it will be very hard to control or stop them from bringing the ice age on Great Britain.

Part 1 of The Cases of Bruce Belmont
Part 4 of Chronicles of the Celestial House