Acnologia, known to be fearsomely reputed as the Dragon King, was a cataclysmically powerful Dragon Slayer that can take the form of a Dragon at any time due from his overuse of Dragon Slayer Magic and bathing in the blood of the Dragons he killed. He was referred to as Doctor in his early life that took care of Dragons but due to them murdering his family, destroying his city, and “claiming” the life of a child, he took it upon himself using the name of the Dragon whom he despised to slay every Dragon in existence, believing they only cause destruction and pain.

Arcane Dragon Slayer Magic: As one of the first humans who entered the Dragon King Festival, Acnologia was also among the first Dragon Slayers brought into existence. Over time, however, as he slew many Dragons, he himself was, eventually, turned into a Dragon due to the extensive overuse of his Lost Magic. Acnologia, contrary to the legends surrounding him, did not entirely become a Dragon and has retained the ability to enter and exit his extremely powerful Dragon Form at will. Acnologia’s Dragon Slayer Magic also grants him the ability to reap the very souls of Dragons, leaving them in a half-dead state. Acnologia has also stated that he has no element, as devouring and bathing in the blood of countless dragons has allowed him to be able to consume any type of Magic to replenish himself, which gave him the name of the Arcane Dragon.

• Arcane Dragon’s Roar: Similar to other Dragons and Dragon Slayers, Acnologia can perform a Dragon’s Roar, which takes the form of a massive breath attack of pure Magic that creates a huge explosion on impact. Said blast, while he was a Dragon, was potent enough to “completely eradicate” the entirety of Tenrou Island and imprint a giant crater into the ocean.
• Arcane Dragon’s Eruption: Acnologia raises his hand and erupts a blast of magic beneath his opponent.
• Arcane Dragon’s Flash: Acnologia raises his finger and fires a giant blast of magic at his opponents.
• Arcane Dragon’s Breath: Acnologia opens his mouth and fires off a bunch of explosions.
• Arcane Dragon’s Explosion: Acnologia exerts his magic in all directions, causing a huge explosion.
• Eternal Flare: Acnologia casts starry lights in the sky, which rain down in a massive radius as beams with huge destructive force.