Blueheart

"Blue Nightmare" ("ブルーナイトメア" "Burūnaitomea") is a searies of cards that includes "Blue Nightmare" in its card name exclusive to the Granblue clan.

Playstyle
Their playstyle revolves around preventing a "Hollowed" unit from retiring by its effect.

List of "Blue Nightmare" Cards
Grade 4
 * Blue Nightmare Abyssal Captain, Blueheart