Oni Island

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Oni Island is a mysterious island located in the New World. The island is most well known for having the biggest volcano on earth, inhabited by the Oni (or Ogre) race, and being the place where the Admirals Legends originated.

Background
The island was thought to be a myth for as long as people can remember. People in the New World claimed that there is an island that appears only at night and disappears by the day. Supposedly, the island changes locations every night as well. Oni Island would appear every day late at night near a different island, then the demons inhabiting the island would travel to the nearest island and completely raid it or destroy it. Also, Onis are supposedly stronger than anything a man can imagine. This has been a famous tale that terrified people until the old Admirals intervened.

Admirals Legends
According to the legends of the New World inhabitants: Several years ago, the island was identified as a threat rather than just a legend. To rid the people from the Ogre's danger, Ex-Fleet Admiral Sengoku dispatched the three old Admirals to the island to wipe the Ogres completely. Aokiji, Kizaru, and Akainu were able to locate Ogres Island and actually defeat the Ogress along with their king in an epic battle. This is also rumored to be the battle where the three Admirals received their nicknames. After wiping out the Ogres and stopping the active volcano on the island, the three Admirals returned home victorious. However, some speculate that some Ogres managed to escape the island before their demise.

Ecology
The island is supposedly made of magma and flames with very rough and rigid structure. The island looks like a huge volcano in the middle of the sea when it appears. It should be notable that the climate and the atmosphere is impossible for a normal human to withstand. Since the island changes locations every night, it's impossible to find without the use of a very rare Eternal Pose. Some say that while on the island, time is lost and you can't tell how much time you've spent on it or what time of the day it is, as if you are in a completely different world.

Landmarks
Biggest Volcano On Earth: Was an active and very destructive volcano. As destructive as it is, it didn't seem to hurt the island or it's Oni inhabitants. The volcano was stopped thanks to the three old Admirals.

Demon Castle: Resides on the very top of the volcano. Lord Ogre, leader of all the Onis, uses this castle as his base. The Lord fell in the battle of the Admirals.

Trivia

 * Oni Island and its events are based on the Momotaro Legends.