Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Even Igneel, king of the fire dragons, and Zeref were afraid to face him in combat -- and the former ultimately died trying.
Source: https://www.cbr.com/one-piece-kaido-vs-fairy-tail-acnologia-stronger-dragon-debate/
He was a demon created by Zeref, given the Dragneel name because he was the strongest demon.
Source: https://gamerant.com/fairy-tail-most-powerful-characters/