Odyssey Island

Introduction
Odyssey Island is a sunken Summer Island that only rises out of the sea once every hundred years. It is said to hold a great treasure.

Ancient Times
In ancient times, Odyssey Island was the location of a prosperous temple. The priests in charge of the temple collected countless treasures and hid them in the belly of the temple. Then, in order to protect their treasures from outsiders and the savage beasts of the island, the priests set up many deadly traps. As legend has it, a sea witch came to the temple requesting sanctuary from the priests. The priests, thinking that the sea witch was trying to trick them into allowing her into the temple where she could steal their treasure, forcefully ejected her from the temple. The witch, disgusted by the greed of the priests, cursed them and their temple. The island then began to sink into the Grand Line. The priests tried to escape, but they refused to leave their treasure behind, causing them to sink along with the island. From then on, according to the witch's curse, the island would rise from the sea every hundred years, but the priests were doomed to remain there forever. This legend led many pirates and explorers to go searching for the island and its treasure, but none were successful until centuries later.

Greenbeard's Discovery
One hundred years before the Battle of Marineford, the island rose from the sea once again. The pirate Greenbeard, who had been searching for the island for years, was finally able to locate and set foot on the island, making him the first man to rediscover the legend. Greenbeard and his crew began searching the temple and the island for the legendary treasure, but many of his men were killed by the temple's traps and others were eaten by savage beasts. The crew, unable to face the dangers any longer, demanded that they leave, but Greenbeard refused to give up his dream. As a result, his crew led a mutiny and left him on the island to die. The island later sunk back into the sea, leaving the treasure unclaimed still.

Geography
Much of the island is taken up by the temple. The temble is a multi-tiered structure with many chambers full of traps. The treasure is said to be hidden in the very center of the temple. The rest of the island is taken up by dense jungle. There are also coral structures on the temple and in the jungle from the time the island has spent underwater.

Trivia

 * The idea for the temple on the island came from the Templ of Pandora in God of War.