Acnologia is a fictional character from the anime and manga series Fairy Tail, created by Hiro Mashima. He is known as the Dragon King and is one of the main antagonists in the series. Acnologia possesses immense power, including the ability to transform into a dragon and manipulate various forms of magic, making him a formidable foe. Originally a human, Acnologia became a dragon slayer and later transformed into a dragon himself. His quest for destruction and dominance leads him to battle many characters, including the members of the Fairy Tail guild. His character embodies themes of power, loss, and the consequences of one's choices.