Also known as "Wings of Darkness", Acnologia is the Black Dragon of the apocalypse. Despite his tremendous power, he rarely appears before humans. During Fairy Tail's fight against Tartaros, he made his appearance with the intention of destroying E.N.D., only for Igneel to emerge from Natsu's body, sparking a deadly clash. Even with his left arm bit off, he won the fight and vanished thereafter.