You may use < Darkness Dragon World > and < Generic > cards.

(PR/0061EN): Fulfill the Blood Oath! Arise, knights of despair.
(H-EB03-★★★★☆) Grind hearts to dust!
(H-EB03-★★★★★): Ravenous fiends walking a wicked path, witness their awesome power!
(D-BT01A-EB01-☆★EN): The dark hour has begun... Luminize, Hollow Black Dragon.
(PR/0199EN): The blood contract has been fulfilled. Congregate, Knights of Despair.

• Card Number: X-TD01-0017
• Rarity: C
• Card Type: Flag
• World: Darkness Dragon World