The nature of the treasure, coupled with what they had managed to learn about Joy Boy and the past, were considered a 'funny story' by Roger, inspiring him to dub the final island 'Laugh Tale'. They learned the truth about what happened during the Void Century, the true nature of the Ancient Weapons, and the meaning of the initial D. As they stumbled upon Joy Boy's treasure, Roger and his crew burst into laughter. The Roger Pirates were eventually able to uncover the enigma behind the Road Poneglyphs, having located them all in this new quest, and reach the mysterious final island 25 years before the current timeline. Roger laughs after finding Joy Boy's treasure.

Having temporarily recruited Kozuki Oden from the Whitebeard Pirates due to his ability to read the Poneglyphs, Roger initiated his final voyage through the Grand Line with the intent of getting to its true end. This, as well as countless stories and denials provided by the World Government, would fuel Roger's beliefs that this supposed place existed and held something of immense value. There, Roger's Log Pose would start behaving strangely, with the needle going haywire and never recording a destination. Roger started suspecting about the existence of a final island after reaching a dead end at Lodestar Island, thirty-nine years ago. Roger and his crew are the only other people known to have reached this island. Sometime during the Void Century, Joy Boy left behind some sort of great treasure on an island located at the very end of the Grand Line. Roger speculated that the World Government prohibits the research of the poneglyphs because they purposely do not want anyone to reach Laugh Tale so that no one will find what is hidden there. When all four points are deciphered, it becomes possible to discern the place at the center of these points where they all intersect, and the true path to Laugh Tale will be made known. Furthermore, the Road Poneglyphs, a set of four special red poneglyphs, each reveal a point on a map of the world once read. It is said that upon reaching Laugh Tale, if one has taken with them along their journey the passages of the poneglyphs, then the Rio Poneglyph will finally be revealed. Poneglyphsīy reading the four Road Poneglyphs, the elusive island of Laugh Tale can be found. Little has been seen of the island, but its shore appears to be composed of steep cliffs with large amounts of wilderness, though there are some objects that appear to be shaped like buildings or fortifications.

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