Halvung Territory Halvung Territory is a volcanic region in " Final Fantasy XI " . It encompasses the twin volcanoes of Zazalda Island and Vozold Island . These islands are ruled over by the Halvung Mercenaries , under the payroll of a Moblin entrepreneur known as Martial Maestro Megomak . This region requires the " " expansion to access . Zones . Halvung . Surrounding the base of Mount Zhayolm , the city of Halvung is a military fortification built by the Troll Mercenaries . While defensive foundations and mercenary barracks constructed from heat - resistant materials can be found above the surface , the bulk of Halvung is concentrated underground . The subterranean complex is favored by the mercenaries ' employers — a faction of Moblins that splintered from Movalpolos in the distant past . The design of Halvung was based on the mobile homeland of the Moblins , with several modifications to allow for the towering frames of the Trolls . The location of Halvung also brings other benefits — cast metal and jewelry crafted using the abundant geothermal energy of the volcano provide a valuable source of black market income . Like Mount Zhayolm , this place is suitable for mining . Throughout the zone are cells where players can rescue NPCs taken hostage after a Besieged event . However , some doors are sealed with a lever that requires a full party of six to open . Mount Zhayolm . Found across the ocean from Cape Mazklah , beyond the Sicklemoon Straits , Mount Zhayolm is an active twin volcano that rises from the islands of Vozold and Zazalda . Home to the Troll Mercenaries , the Halvung Territory was once recognized by Aht Urhgan as an independent state of the Empire . The constant rain of volcanic ash combined with occasional emissions of sulfuric gas have created a wasteland almost completely devoid of plant and animal life — an inhospitable land that saw very few travelers before the emergence of the Astral Candescence and the ensuing struggle . The area is divided into two islands : the larger Zazalda Island to the east , and the smaller Vozold Island to the west . There also exists two smaller islands accessible through Halvung . Generally speaking , the more dangerous monsters such as Dahaks are on Vozold Island . Some large metal doors known as the " Gates of Halvung " require a certain key item to open . Due to the volcanic nature of the zone , this place is a hotspot for mining . Prior to the release of Abyssea , this zone was the most popular place for Black Mages , Red Mages , and Scholars to level up , due the fact that both puddings and the larval wamouracampa are ideal targets for manaburn parties or solo mages . With the advent of the add - ons , these camps have been largely abandoned . Navukgo Execution Chamber . This small cavern located at the heart of the Halvung Territory is accessible only from Vozold Island , and is buried deep underneath Mount Zhayolm . The treacherous road to the chamber means that adventurers steer clear , venturing there only for a few select battles . It is used as a battlefield for story missions and ISNM . Lebros Cavern . An expansive cavern on the eastern side of the Halvung Territory . Filled with lava and other dangers common to the volcanic region the cavern has the been the site of many battle between the Imperial Army and the Troll Mercenaries . This area is one of the six Assault areas .