The Elbaph arc of One Piece has revealed quite a lot of information about the history of the world, including the Void Century and some powerful Devil Fruit users from it. Thanks to the Harley, Oda has dove deep into history, but more than that, the lore of this country also sheds some light on entities that existed long ago in the past, such as the Nidhoggr. Thanks to the existence of Nidhoggr, as well as Imu's deep connection to the beast, it has now been established that the Void Century saw this dragon soar in the skies hundreds of years ago.

One Piece Chapter 1175 established a deep connection between Imu and the Nidhoggr dragon. When Loki emerged from the Underworld of Elbaph, he started wreaking havoc in the Sun World almost immediately. Loki was able to crush Saint Sommers and, at the same time, destroy the vast majority of the MMA that were running amok in Elbaph. However, Imu was clearly not fazed by Loki's abilities. Imu even faced up to the Nidhoggr, stating that it was about time they found out where the Nidhoggr was.

The way Imu spoke about the Nidhoggr felt as if they had a deep history. In fact, it can be said without a shadow of a doubt that Imu and Nidhoggr have some history. Ever since the conclusion of the war, the sovereign of the world has been searching for this ability, which means that the Nidhoggr was active at some point during the Void Century.

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