WARNING: The following contains spoilers for Fena: Pirate Princess, now streaming on Crunchyroll and Adult Swim.
Fena: Pirate Princess took the titular Fena Houtman and her comrades from the Goblin Knights on an adventure spanning the entire globe. To cap things off, their journey's end led them to a land known as Eden. Whispered about throughout the series, Eden had been described as the Vault of the Earth, containing all the world's greatest treasures. Its reveal certainly did not disappoint in that regard, as it contained a hoard of some of the most legendary antiquities of all time. Drawing from real-life history and mythology, these are some of the most notable relics and icons that were uncovered as part of the prize of Eden.
Eden and El Dorado
Rising from the ocean like Atlantis, the most apparent treasure to be dredged up from the sea is Eden itself. Eden was long sought after as the goal of almost everybody in Fena's sphere of influence, and its rich rainbow foliage indicates that the land is likely the biblical Garden of Eden. As a literal paradise on Earth, the Garden of Eden was the first home of humanity in the story of Genesis.
Throughout the anime, several characters identify this place by other names as well. This includes the antagonistic pirate captain Grace O'Malley associates the island with El Dorado. El Dorado is the famed city of gold pursued by the conquistadors during their raids through Central and South America. The gilded metropolis was likely an invention of the invaders' imaginations, but Eden certainly fits the bill. The island is said to contain the treasures of stashes from the Knights Templar, the San Miguel shipwreck, and Captain Kidd, as well as artifacts such as the Holy Grail.
The Ark of the Covenant
Deep within the confines of Eden's treasury, Shitan discovers a golden box that causes him to stare in awe. The Ark of the Covenant, which served as a marker for the dwelling place of God in the Temple of Solomon, was the container that held the Ten Commandments. It is described in the Book of Exodus as being adorned by two golden cherubim with wings that stretch over the cover of the vessel. The Ark has occasionally killed people for coming into direct physical contact with it, due to divine law and its holy significance.
The box found in Eden fits the traditional description of the Ark of the Covenant perfectly. Shitan previously described the room he had been searching for as the tomb of King Solomon. Solomon was known as the wisest man to ever live, providing further connection to a biblical figure associated with the item. The Ark has been the subject of many searches for legendary artifacts throughout fiction and literature.
The Library of Alexandria
Upon entry to Eden, the Goblin Knights are surprised to find the central hallway leading to the treasure room to be lined with countless books. Karin muses that these tomes could theoretically be the collection from the ancient Library of Alexandria. Though the crew does not examine this idea, Karin thinks that it would be quite the find if it were the case.
The Library of Alexandria was perhaps the largest and most famous archive of writing from ancient times. Filled to the brim with scrolls, it is said to have contained over 100,000 books' worth of information. Popular conception holds that the establishment and its accumulated compositions were destroyed in a massive fire. In actuality, scholars believe that the library was demolished over the course of numerous events, the most noteworthy of which was its accidental burning during Julius Caesar's civil war across the Roman Empire.
Kusanagi no Tsurugi
Even though the Goblin Knights demonstrated their loyalty to Fena, Shitan made it clear that their official mission was to retrieve a sword known as the Kusanagi no Tsurugi. He indicates that the sword holds special importance to the Imperial Family of Japan, but the reason for this is not presented. Shitan finds the sword in the same room as the Ark of the Covenant where it had been placed after being smuggled out of the country.
The actual Kusanagi no Tsurugi is regarded as one of the Three Sacred Treasures which make up the Imperial Regalia of Japan. The blade supposedly emerged from the decapitated body of the eight-headed serpent Yamato no Orochi after its fight with the god Susanoo. Its name means "the grass-cutting sword," taken from the legendary warrior Yamato Takeru, who used it to control the wind during a battle in a grassy valley. The other two Regalia are the Yata no Kagami mirror and the Yasakani no Magatama jewel, both of which played a part in luring the goddess Amaterasu out of hiding.
Noah's Ark
The culmination of Fena's quest happens amidst the desiccated remains of a massive ship. Here, she receives the revelation that she is the latest Maiden of Choosing, who will decide whether or not the world is to be destroyed. Through a vision, she is shown that if she chooses the world's destruction, she and Yukimaru will be tasked with voyaging across the Earth in a ship that grants salvation to a select number of beings from the old creation.
The proportions and reference to a watery apocalypse immediately link this boat to Noah's Ark from Judaism, Christianity, and Islam. The Ark was commissioned by God to help Noah, his family, and a pair of every animal species avoid a divine flood that annihilated all other life. Similar stories of escape from a great deluge via watercraft can be found in the story of Utnapishtim from the Epic of Gilgamesh and the Greek legend of Deucalion and Pyrrha.
