Shadow Lord ( boss ) The Shadow Lord is the final boss and first main antagonist of " Final Fantasy XI " . He is the target of Mission 5 - 2 in the Bastok , San d ' Oria , and Windurst campaigns , in the shared battlefield known as " The Shadow Lord Battle " . This battlefield marked the conclusion of nation rank missions until they were expanded upon in " " . The Shadow Lord has reawakened twenty years after his defeat in the Crystal War and adventurers have been called forth to stop him . He is also fought as a mission boss in the Campaign Op " Fiat Lux " , which is a part of the " Wings of the Goddess expansion . Strategy . The Shadow Lord Battle ( Phase 1 ) . Shadow Lord is a fairly straight - forward fight compared to bosses that appear later in " Final Fantasy XI " ' s history . He does not employ any strong debilitative statuses and strikes with only a moderate number of AoE attacks . He does however employ unique stances in battle . In this phase , the Shadow Lord uses a variety of physical and magical attacks until 50 % HP , when he will become immune to either physical or magical attacks . This is indicated by the stance and behavior he takes . The Shadow Lord will switch immunity after taking a certain amount of damage , or after approximately 5 minutes . This means that parties need to be able to deal damage from both physical and magical sources , or they will be unable to deal damage to the Shadow Lord before running out of time . The Shadow Lord Battle ( Phase 2 ) . In his second phase , the Shadow Lord does not attack with normal attacks and will only use Implosion , but does so incessantly . Because the range of Implosion is rather wide and its damage is considerable , it is necessary to defeat him quickly here before Implosion overwhelms the party . As the battlefield is uncapped and he only has approximately 4000 HP in this form , players with high damage output will be able to defeat him in this phase before taking substantial damage . Fiat Lux . ' The Campaign Op ' Fiat Lux " is only unlocked when the Fauregandi and Valdeaunia fronts are both captured by Allied Forces in campaign . Additionally , for a nation to have it unlocked , it must also have captured four outdoor areas in its theater of war . Players wishing to take part must also possess the highest decoration , the Medal Of Altana ∮∮∮∮ . This makes the Campaign Op considerably hard to access . Shadow Lord attacks in two stances , one with a single greatsword , and the 2nd when he breaks the sword into two halves and dual - wields them . Each stance comes with its own set of special moves and he is able to switch at will . When switching stances , Shadow Lord gains a 10 second invulnerability . When dual - wielding swords , Shadow Lord is also able to use Spawn Shadow , which summons copies of himself to aid him in battle . These shadows have very low HP but hit with the same attack power as Shadow Lord himself and also simultaneously use the same moves as Shadow Lord when he uses them . Players need to have a strategy to deal with these shadows in order to survive the battle . Defeating Shadow Lord causes a treasure chest with rewards to spawn . Of these rewards are unique pieces of equipment exclusive to this battlefield , including equipment which resemble the armor that Shadow Lord wears . ( used only when dual - wielding 2 swords ) ( used below 25 % HP ) Music . The music that plays during both battlefields is " Awakening " . It is also used as the music for Bastok mission battlefield Where Two Paths Converge , Dynamis - Xarcabard , and Bastok nation quest Bonds of Mythril .