Relentless The Relentless was an " Imperial I " - class Star Destroyer commanded by Admiral Kassius Konstantine . On the day of the Galactic Empire ' s fifteenth anniversary , it was requisitioned by the Grand Inquisitor , the Emperor ' s Jedi hunter , to give chase to a group of rebellious individuals who tried to smuggle Tseebo off of the planet Lothal . History . Pursuit of the " Ghost " . The " Relentless " was an " Imperial I " - class Star Destroyer under the command of Admiral Kassius Konstantine . On the day of the Galactic Empire ' s fifteenth anniversary , it was requisitioned by the Grand Inquisitor , the Emperor ' s Jedi hunter , to give chase to a group of rebellious individuals who tried to smuggle Tseebo off of the planet Lothal . The Inquisitor had placed a XX - 23 S - thread tracker on the rebels ' ship , the " Ghost " , and started pursuing them in hyperspace . When the rebels found the tracker , they discovered it had actually attached to the ship ' s shuttle , the " Phantom " . So two of the rebels , the Jedi Kanan Jarrus and Ezra Bridger , detached the shuttle and landed on Fort Anaxes . The Grand Inquisitor , onboard the " Relentless " , followed the signal , enabling the " Ghost " escape while the Inquisitor and his troops faced the rebels on the asteroid , being defeated . Deceit of Calrissian . Later the rebels , working with the smuggler Lando Calrissian , tried to sneak past the Imperial blockade of Lothal after acquiring a puffer pig from the crime lord Azmorigan . The " Ghost " had a signature modulator to disguise itself when dealing with Imperial ships . Some problems with the pig , however , led to the modulator being disabled , so the " Relentless " was able to identify the ship . Konstantine deployed TIE fighters and tried to take down the " Ghost " with turbolaser s , but the light freighter took cover in Lothal ' s clouds , shooting the TIEs down and preventing the " Relentless " from continuing the pursuit . Siege of Lothal . The " Relentless " was one of the Star Destroyers chosen by the Empire to besiege Lothal . The rebels , after leaving Capital City , asked Calrissian to help them smuggle themselves offworld , and he offered them some equipment to leave the planet without being detected by Imperial forces . They launched some modified masking transponder s in Lothal ' s sky , which replicated the signal of their stolen " Sentinel " - class landing craft . Konstantine deployed TIE fighter squadrons to follow the signals , but by the time he understood the rebels ' trick , they had already departed Lothal ' s atmosphere . However , Konstantine and his crew were mollified when it was revealed that Darth Vader had already placed a tracker on the shuttle . The Sith Lord reached the rebels , who had rendezvoused with their allies in Phoenix Cell , and attacked their ships with his TIE Advanced x1 . The " Relentless " and other Star Destroyers joined Vader when the battle was already lost for the rebels in an attempt to prevent their enemies from escaping . While Vader had succeeded in destroying the rebel command ship " Phoenix Home " , most of the Phoenix fleet , with the exception of the " Ghost " , had already managed to flee into hyperspace . The " Relentless " and another Star Destroyer attempted to trap the " Ghost " . However , the freighter ' s captain , Hera Syndulla , managed to jump into hyperspace before the " Relentless " and the other Star Destroyer could activate their tractor beam s , and they captured Vader ' s TIE Advanced instead , to Konstantine ' s horror . Hunting the rebellion . Following the attack on the Phoenix fleet , the " Relentless " took part in a hunt for the fleeing rebels throughout the Outer Rim Territories . At a later point , Admiral Konstantine and Agent Kallus received a transmission from the former Clone Commander Wolffe that the crew of the " Ghost " were on Seelos . While the " Relentless " stayed in space to provide backup , Kallus led a ground assault force of three AT - AT walkers against the crew of the " Ghost " and the clone troopers Rex , Gregor , and Wolffe , who manned an antiquated AT - TE walker . The " Relentless " was unable to provide air support to Kallus ' forces during the battle because the ship had received orders to pick up an Inquisitor known as the Fifth Brother in deep space . Later , the " Relentless " detected a power surge from an abandoned Old Republic " Haven " - class medical station in deep space . The surge had been caused by several crew members of the " Ghost " crew , who were salvaging medical supplies from the abandoned station . When Admiral Konstantine offered to provide reinforcements , the Fifth Brother insisted on going alone . During the ensuing skirmish , he another Inquisitor known as the Seventh Sister nearly succeeded in capturing several rebels including Chopper , Ezra Bridger and Sabine Wren . However , the rebels were able to escape due to the quick thinking of Garazeb Orrelios . After the Seventh Sister and the Fifth Brother discovered that the Phoenix rebels were hiding on the planet Garel , the " Relentless " was part of the Imperial fleet that attacked Garel . During the battle , the " Relentless " and its fellow Star Destroyers bombarded the escaping rebel ships and unleashed several TIE fighters . Under the command of Admiral Konstantine , the " Relentless " also managed to snag the rebel command ship " Liberator " with its tractor beam projector . However , Hera managed to use the " Ghost " to knock out the " Relentless " tractor beam projector , allowing the " Liberator " to flee into space . The " Relentless " later led an attack on the Phoenix rebel fleet , which was low on fuel . When the ship ' s scanners picked up the rebel ship known as the " Ghost " , Konstantine recognized it as the vessel that had raided the Imperial fuel depot at Horizon Base . Realizing that the rebels were low on fuel , he ordered the " Relentless " and its TIE fighter escorts to prevent the " Ghost " from landing . Despite their best efforts , the " Ghost " managed to land due to the timely intervention of Ketsu Onyo ' s starship , the " Shadow Caster " . After receiving intelligence from the astromech droid Chopper and the inventory droid AP - 5 , the rebel fleet fled to Atollon , a safe system with no Imperial presence .