Derfland Derfland is a region of central Quon in " Final Fantasy XI " . This massive peninsula jets out into the Bastore Sea . It nearly reaches the Grand Duchy of Jeuno at its tip . However , far from the reach of Jeuno and within the marshlands at the base of the peninsula , the Quadav continue the construction of their new city of Beadeaux . Conquest . This region is subject to conquest . Zones . Pashhow Marshlands . The Pashhow Marshlands , in direct contrast to the Konschtat Highlands to the south , are located near sea level , resulting in a wet , swampy landscape . The countless bogs and floating islands of vegetation make the area extremely difficult to traverse , but it is the presence of the Quadav that causes many travelers to shun this dangerous territory . Their stronghold , Beadeaux , lies in eastern Pashhow and the armored beastmen maintain a significant presence in the marsh . The creatures native to Pashhow are typical of boggy environments . Leeches , flies , and crawlers are numerous and non - aggressive . A population of Goobbues subsists here as well , however , and its towering members have no affection for adventurers . Derfland ' s regional outpost is located in the northern marsh near the path to Rolanberry Fields . A Cavernous Maw also connects Pashhow to itself twenty years in the past . Rolanberry Fields . The Rolanberry Fields have been used for centuries to cultivate the fruit for which they are named . Considered a delicacy by Humes and Elvaan , the farmers in this region have perfected their craft and are now able to harvest the sweet berries year - round . Three bridges at Rolanberry ' s northeastern corner lead across the sea to its neighboring areas : the Lord Bolicevre Bridge to Batallia Downs , the Market Bridge to the Grand Duchy of Jeuno , and the Great Jeuno Bridge to the Sauromugue Champaign on the eastern continent of Mindartia . A Cavernous Maw connects this area to itself twenty years in the past . Crawlers ' Nest . The Crawlers ' Nest is a web - filled cave in southwestern Rolanberry Fields infested by the eponymous insect . While the extermination of these vermin by adventurers is approved and rewarded , the Jeunoan military has never made an effort to clear the tunnels itself . Some speculate that the lack of action by the Duchy is a consequence of the economic benefit it enjoys from the sale of silk , a valuable commodity produced by the crawlers . During the Crystal War the nest was host to an outpost manned by the Federation of Windurst . Most of the fortifications and constructions built in that time have disintegrated . Though crawlers are the most prevalent inhabitants of the area , a variety of other fauna dwells alongside them . Funguar , scorpions , lizards , beetles , and bees thrive in the nest . While the insects at the entrance are not aggressive , those lurking beyond the humble worker crawlers are extremely hostile . Though the cave no longer contains anything of particular historic importance , obtaining its map is unusually demanding . At the behest of Abelard , the mayor of Selbina , adventurers must trudge up and down the length of Vana ' diel in search of fifteen stone monuments left by Gwynham Ironheart . Only having done so may they finally receive a map to chart paths through the nest . Beadeaux . Beadeaux is the primary stronghold of the Quadav . It was established deep within the Pashhow Marshlands , far from the reach of Bastokan and San d ' Orian forces , during the Crystal War . To continue the construction of their city , they have relentlessly stolen large quantities of non - rusting mythril from Bastok . They have also adopted the metalworking techniques of the Republic ' s craftsmen . Beadeaux ' s unique topography , with a little help from rudimentary constructions , forms a natural fortress . A narrow entrance extends from Pashhow and visitors find themselves standing in mud and surrounded by earthen walls on all sides . To travel from place to place , adventurers must brave the stronghold ' s maze - like tunnels and emerge elsewhere in the swamp . The Quadav have constructed massive devices that curse passerby at multiple locations . To avoid this malady , wayfarers must use separate artifacts , the so - called " mutes " , to inflict the silence status upon themselves . The presence of these structures makes traveling through Beadeaux slow and dangerous . Its deeper reaches are also occupied by increasingly powerful Quadav as they defend the Qulun Dome and the seat of their master , the Adamantking . Qulun Dome . Qulun Dome is a dark chamber beneath the Beastmen stronghold of Beadeaux . It is the throne of the Quadav leader , Za ' Dha Adamantking . Rumors of magicite stored here are of great interest to the Alliance of Altana .