Invasion of Voss The Invasion of Voss , also known as the Defense of Voss , was a major battle during the revolt against the Eternal Empire of Zakuul . After Eternal Empress Vaylin send her Eternal Fleet to assault Voss in search of her mother Senya Tirall , the Alliance that opposed the Eternal Throne came to the planet ' s defense . Theron Shan and Sana - Rae coordinated the Voss commandos in the capital city of Voss - Ka , while the Alliance fleet engaged the Eternal Fleet in orbit . The Alliance Commander traveled to the surface along with Lana Beniko and Torian Cadera , who commanded a squad of Mandalorian warriors into battle . Engaging skytrooper s throughout the burning city , Beniko and the Commander attempted to reach the northern city plateau before it was completely destroyed , then made their way to the Tower of Prophecy , where they helped Theron Shan to defending the position against Vaylin ' s Horizon Guard s . Senya Tirall contacted the Alliance from the Shrine of Healing and pleaded for the aid , believing that if healed by Voss Mystics , former Eternal Emperor Arcann would join their side . Making their way to the Shrine , the Commander met with Senya and agreed to assist her , ordering Lana and the Mandalorians to protect the Shrine . Senya ordered the Mystics to use her strength to heal her son in a Voss healing ritual , which was successful , but let Arcann confused , causing him to flee . Vaylin ordered the Eternal Fleet to burn the planet regardless of casualties , but the tide of the battle was turned by the arrival of the Imperial Navy , which turned the Eternal Fleet away . Sith Empress Acina then greeted the Alliance Commander and invited them to Dromund Kaas to discuss a potential alliance against Vaylin . Prelude . During the Battle of Odessen Senya Tirall rescued her critically wounded son Arcann from the debris on his flagship , managing to take the former Eternal Emperor into his personal shuttle and flee into hyperspace in hopes of redeeming him . In Arcann ' s absence his sister Vaylin claimed the Eternal Throne and , as the new Empress of Zakuul , declared a bounty on her mother , searching the galaxy for months . At one point Senya came into contact with a dissident group of Zakuul Knights who were willing to help Senya heal the former Emperor on Ord Mantell . However , Vaylin found out about the Knights and after massacring all of them , waited for her mother . When Senya arrived , Vaylin attacked her and the two fought amidst the burning rhydonium , the fight only ending after Vaylin pierced the hyperdrive of a damaged starship with a lightsaber pike , enabling Senya to escape with Arcann . Though she intended to kill her mother , Vaylin took this opportunity to track her back to Arcann , leading her to Voss . Senya made it there to bring Arcann to the Shrine of Healing , where she hoped to use the Voss healing ritual to heal both Arcann ' s injured body and his spirit , curing him of the hatred that had consumed him . Voss had previously already experienced subjugation from the Eternal Empire when a Star Fortress was placed in orbit of the world . The battle . Retaking Voss - Ka . Having followed her mother ' s trail , Vaylin launched an attack , determined to hunt her family down . At this time , Alliance operatives Theron Shan and Sana - Rae were already onworld to meet with an informant who claimed to know of Arcann ' s whereabouts . Their rendezvous was interrupted when Eternal Fleet arrived in Voss system , and Shan alerted the Alliance about the attack , allowing the Alliance Commander to scramble the Alliance fleet in response . The Eternal Empire began deploying ground forces to the capital city of Voss - Ka , led by Vaylin ' s new Horizon Guard and composed of Knights of Zakuul as well as numerous skytrooper s . From the Eternal Throne Vaylin ordered her forces to begin the search and torch the planet behind them , and the Eternal Fleet opened fire on Voss - Ka , causing buildings to collapse and fires to spread throughout the capital . Theron Shan attempted to rally Voss commandos to the defense , but their forces were outmatched , and he led a group to take shelter in the Tower of Prophecy along with Sana - Rae . Emerging from hyperspace , the Alliance fleet arrived in orbit of Voss and - despite the " Gravestone " not yet being present - successfully engaged the Eternal Fleet . A stolen Zakuulan shuttle allowed the Commander , Lana Beniko and Torian Cadera with a group of Mandalorian commandos to slip past the Eternal Fleet blockade and reach the burning city of Voss - Ka . Landing in the Republic District , the Alliance and Mandalorian forces engaged Zakuulan Knights and skytroopers in an attempt to retake the capital . After the Republic District was cleared of enemy forces , Theron Shan contacted the Commander and Lana and asked them to assist the Alien Enclave , while Theron and his warriors stayed behind to hold their position . In the Alien Enclave Market Lana and the Commander attacked a massive PA - 717 Planetary Assault Goliath ; the droid was protected by XD - M8 Remote Mine s , but " Deadeye " Leyta and her strike team provided the remote assistance , allowing the Commander and Lana to prevail . They then moved towards the northern plateau that housed the Imperial District , but the Eternal Fleet bombardment completely obliterated it . Theron then directed them to a location where Voss Commandos provided access to a service tunnel that led the Commander and Lana to the Voss - Ka Cantina on the other side of the city . Vaylin ' s forces were gunning after Voss civilians in the Judicial Quarter , but Rokuss and his Gormak soldiers volunteered to save them , leading the Commander and Lana with a clear route to the Tower of Prophecy . Theron met them right outside the entrance and rushed everyone inside , where along with the Voss Commandos the group repelled an attack by sabotage droids , skytrooper s , Zakuul Knights , and Horizon Guard . Assault on the Shrine of Healing . After meeting with Sana - Rae , the group received a distress call from Senya , who revealed her presence on Voss and pleaded the Alliance for aid , promising that Arcann would join their fight if healed . Though Theron and Lana had different ideas on what do to about Arcann , everyone agreed that it was imperative to reach the Shrine of Healing before Vaylin . The Commander ordered Lana to take the Mandalorian forces and lead them towards the Shrine , while Theron used his shuttle to get the Commander and himself to the Old Paths that lead to the Shrine . To help them break through the enemy forces in their way , Torian delivered the " Storm Rider " walker to their location , which the Commander and Theron used to stomp the skytroopers in their path . As they progressed , the Eternal Fleet warship s that entered the atmosphere began bombarding the only road to the Shrine , only to Koth Vortena to finally join the fight on the " Gravestone " and begin using it against the fleet . With the path relatively safe , the " Storm Rider " had to dispatch an Eternal Empire Walker called the " Talon of Izax " that guarded the entrance to the Shrine . Theron and the Commander then disembarked and made their way inside past the Voss and Gormak soldiers , who united to defend their homeworld in the face of a larger threat , ending the centuries long war between two species . Inside the Shrine , the Commander and Theron met with Senya , who was separated from them by a ray shield and bargained for her son ' s life , promising that once his mind was cured of the hate , Arcann would join the Alliance ' s cause . Vaylin then called and addressed the group through a skytrooper holocomm , taunting her family and ordering the Eternal Fleet to bombard the Shrine in an attempt to kill them all , completely destroying the Shrine ' s upper levels . Senya asked the Commander to hold of Zakuulan forces so that the Voss healing ritual could be completed and rushed to her son after they agreed . Lana and her team of Mandalorians held off Zakuulan forces from pouring into the Shrine , while the Commander and Theron collapsed the tunnel behind them to stop the ones already inside from reaching Senya ' s position . Senya herself battled and single - handedly defeated a host of Zakuulan Knights , but as it became clear that their position was about to be overwhelmed , Senya ordered the Voss Mystics to take her strength to heal her son . The Mystics complied and transferred her strength to Arcann , healing his injuries and mending his broken spirit , though this act left Senya comatose . Arcann awoke confused and , witnessing his mother ' s lifeless body , fled the Shrine back to his shuttle , believing her dead . Having held of Zakuulan forces as long as they could , Lana and the Mandalorians regrouped at Senya ' s position , where Lana rushed alongside the Commander to intercept Arcann before he could reach his shuttle . However , they were too late to stop Arcann ' s departure , who managed to get the shuttle in the air despite lacking his cybernetic arm . The Commander ordered Koth to disable the shuttle , but the " Gravestone " was under heavy fire and unable to assist , leading to Arcann ' s escape into hyperspace . At this point Vaylin has ordered the Eternal Fleet to burn her entire family regardless of casualties on Voss . Just as all seemed lost , the tide of the the battle was turned by the arrival of the Imperial Fleet , led by Sith Empress Acina herself . Tired of submitting to the Eternal Empire , Acina joined the Alliance in the open revolt against Zakuul , voiding the Zakuul – Imperial treaty . " Harrower " - class dreadnoughts opened fire on the Eternal Fleet warship s , destroying several of them and prompting the GEMINI captains , granted free will by SCORPIO , to flee in self - preservation . Aftermath . After her ships had driven the Eternal Fleet from Voss , Empress Acina contacted the Alliance Commander and extended a formal offer of alliance against the Eternal Throne . The Commander agreed to consider Acina ' s offer and departed directly to Dromund Kaas along with Theron Shan and Lana Beniko . Meanwhile , Vaylin was furious that the GEMINI droids have retreated from battle against her orders and threatened to dismantle them , requiring SCORPIO to encourage the Empress to focus on the big picture . Senya Tirall was transferred to the Alliance base on Odessen , where Doctor Juvard Illip Oggurobb stabilized her condition and began looking for possible treatments for her coma . In the end , although Voss was saved from the full destructive might of the Eternal Throne , it suffered heavy losses , with much of the planet devastated and thousands of Voss and Gormak killed . Behind the scenes . Several aspects of the battle play differently depending on the player ' s choices . Rokuss and his Gormak soldiers rescue civilians only if the player completed the mission to destroy the Voss Star Fortress prior to starting " " Chapter I : Wrath and Ruin , otherwise the optional task falls to the player . Likewise , even though " Deadeye " Leyta makes no actual appearance , her involvement in the battle is mentioned in a special ability available only if the player had previously destroyed the Tatooine Star Fortress . If the player ' s Dark Side choices caused Koth Vortena to abandon the Alliance and steal the " Gravestone " , he will participate in the battle independently to protect civilians , and will ignore the player ' s calls for help at every turn . The biggest difference is caused by the player ' s choice to either help Senya Tirall in healing Arcann or refuse to assist her . If the player takes the Dark Side option , they will order Lana Beniko and the Mandalorians to attack Senya instead of holding off Zakuul an forces . Senya will hold her own against the Mandalorians before engaging Lana in a duel , which is interrupted by player ' s arrival . Arcann escapes without being healed , and blaming Valkorion for her failure , Senya engages the player in combat and is mortally wounded before expiring . Following this choice , Arcann will attack the player to avenge his mother during Chapter VI : The Dragon ' s Maw and will also be killed , never achieving redemption .