Grudge of the Shadow Knights Master

Nobody knows the affiliation and objective of the Shadow Knights in Calpheon. It is rumored that a certain figure follows these knights around in secret, wherever they go. Soldiers of Calpheon somewhat oddly refer to this figure as the "Grudge of the Shadow Knights Master." They came up with this name after a fierce battle between the Calpheon knights and Shadow Knights, when Calpheon soldiers saw this unknown figure attacking Shadow Knights from behind.