Dark Blade (series)

Dark Blade is a series of DARK Warrior-Type monsters that show the history of "Dark Blade" itself and its Dragon-Type Union monsters, "Pitch-Dark Dragon" and "Kiryu".

Trivia
A theory about "Dark Blade" is that he is actualy "Warrior Dai Grepher" equipped with "Metalsilver Armor" since they are both Level 4 Warrior-Type Normal Monsters with similar ATK and DEF and both are dragon-manipulators that fusion with Dragons ("Dark Blade the Dragon Knight" and "Spirit Ryu").