Boc Aseca, articulated as Bocas'eca in the Twi'leki language, and carrying the moniker Boc the Crude, was a male Twi'lek. He distinguished himself as one of the Seven Dark Jedi confronted and vanquished by Kyle Katarn during Katarn's mission to safeguard the Valley of the Jedi. Initially aspiring to the ranks of the Jedi, this Twi'lek's ambitions were dashed when the Jedi Order deemed him too advanced in age. Years later, Boc aligned himself with the Galactic Empire, becoming the most deranged and sadistic follower of Inquisitor Jerec.
Boc came into the world on Ryloth in 32 BBY; coincidentally, Anoon Bondara, the Jedi Watchman for that system, met his end in the same year. Although Boc possessed Force-sensitivity from birth, this trait remained undiscovered for quite some time. Boc held in high regard the accomplishments of renowned Twi'lek Jedi heroes like Tottdon'eeta from the era of the Old Sith Wars, and New'arforrth during the Ruusan campaign. However, by the time Nejaa Halcyon identified his talent, Boc was past the age for Jedi training. His aspirations shattered, Boc felt robbed of his intended fate.
Boc had the rare ability to use psychometry through the Force, enabling him to extract "memories" from objects by touching them. The ashes from Forrth's funeral were turned into three idols resembling him. Boc used the Force to glean impressions from these idols, accessing fragments of Newar's experiences. He found himself captivated by the glimpses of Jedi triumphs at the Battle of Malrev IV and Ruusan. This only intensified his desire to become a Jedi Knight.
The emergence of the Galactic Empire and the Great Jedi Purge once more dashed Boc's dreams of becoming a Jedi. Adding insult to injury, the Empire also supported the Twi'lek slave trade. Boc ended up serving as a manservant to the severe and prejudiced Vice Admiral Terrinald Screed. Inquisitor Jerec detected the Force-sensitivity in Screed's new servant and demanded his transfer to the Inquisitorius for execution. Screed complied, handing the Twi'lek over.
Jerec, however, had other plans for him, suspecting that Boc possessed knowledge of the legendary Valley of the Jedi, which Jerec sought. Jerec employed the Force to extract the information Boc had gathered about Ruusan. He enslaved Boc, granting him a brutal, pseudo-apprenticeship that deepened Boc's animosity toward Humans. Ultimately, Boc did become a Jedi – a Dark Jedi.
Boc was among the six Dark Jedi, along with Yun, Sariss, Maw, Gorc, and Picaroon C. Boodle, who joined Jerec in his pursuit of the Valley of the Jedi. During the Subjugation of Sulon, Maw and Boc were assigned the task of decorating the walls of Barons Hed with the heads of the defeated Rebels.
During the Mission to Dorlo, he was aboard the assault shuttle that boarded Duno Dree's transport, which was disabled above the planet. He demanded the Rebels surrender, and after the ultimatum, he instructed his force of commandos to drill a hole in the hatch and pump in sleeping gas. Soon after, they strapped Qu Rahn and his companions to stretchers and transported them to the shuttle, which took them to the Vengeance.
When Jerec presented his apprentices to Rahn, Boc reminded Jerec of his promise to deliver the Jedi's heart. Rahn mocked him, saying that he couldn't win his heart, infuriating the Crude Twi'lek, who threatened to cut out his tongue. Jerec silenced him, pointing out that the Jedi was trying to provoke Boc's anger, and he should instead focus it. During the interrogation, Jerec executed two of the Rebels because Rahn refused to reveal what he knew about the Valley of the Jedi. Then came the turn of Duno Dree, a young pilot who was crying and shaking in fear, yet as he bravely turned to Jerec, once more, defying him, Boc accepted the role of executioner, and in a swift motion, he snapped the neck of the young Human. When finally Rahn remained alone, totally defeated, he stole Yun's lightsaber and attacked Jerec's peers. Boc awkwardly performed some spins and then gracefully attacked Rahn's head and missed; in a movement Rahn severed one of the Twi'lek's tendons, who fell down, but Yun pulled him away. He was later taken to the sick bay and his tendon was reconnected, but caused him pain and limping.

Jerec probed Rahn's mind and discovered that the secret to the Valley of the Jedi he desired was located on Sulon, the home of Morgan Katarn, whom Jerec had murdered years prior. Boc, Sariss, and Yun were dispatched to Sulon to investigate, where they found a map etched onto the ceiling of the farmhouse. There, the three Dark Jedi numbered the tiles and removed them, loading them onto a shuttle with a grav pellet. He argued briefly with Yun when he complained about his aching leg, and about how Jerec tolerated them. When Yun asked for instructions, Boc referred him to Sariss. Before their departure, Boc sensed that they were being observed. Sariss dismissed his concerns, assuming they had merely attracted attention, but Boc clarified that he was sensing a Force-sensitive presence. They then departed for Baron's Hed. It turned out that the presence he sensed was Kyle Katarn, who had returned to his home.
Eventually, the Map gave Jerec all the necessary information and his fleet traveled to the lost planet of Ruusan, the location of the Valley. While in orbit, they discovered Fort Nowhere, a settlement of smugglers and dissidents. On Jerec's orders, Sariss, accompanied by Boc and Yun, descended to "negotiate" with the settlers, conducting a reconnaissance flight in an assault shuttle. Yun wondered what was so terrible that made the dissidents relocate to such a dumpsite, and Boc remarked that they were fleeing from them: the Empire.

Marie Peeno permitted the shuttle to land in the Fort, drawing curious settlers. They were surprised to see the three individuals carrying lightsabers, including "a worm-head." After Sariss made an example of a dissident, fear gripped the rest, causing them to scatter, which made Boc laugh hysterically, intensifying their fear. While Sariss interrogated the officials, Boc and Yun searched the Fort, finding no evidence that the settlers knew anything about the Valley or the planet's history. Sariss falsely claimed that the Empire would leave the colonists alone after their cooperation but planned an attack soon after. The three Dark Jedi participated in the ensuing battle of Fort Nowhere, emerging from assault shuttles to massacre the citizens. Boc was finishing off the wounded.
Back on the Vengeance, Jerec summoned Yun, and Boc opened the young Jedi's hatch. Yun, experiencing one of his nightmares, sensed the light, rolled off his bed, and activated his lightsaber. Boc laughed at his nervousness and informed him that Jerec needed his "scrawny presence." Yun took a threatening step forward, prompting another laugh from Boc, who advised him to save his aggression for later. Asked about dreaming about blood, Boc replied to Yun that what keeps him warm every night.
It turned out that Jerec wanted Yun to be present during the "excavations" or looting of artifacts from the Valley of the Jedi. These operations had stirred the trapped spirits of ancient Jedi and Sith, who, after centuries of imprisonment, screamed and harassed the Imperials. Consequently, the powers of a Jedi were needed to restrain them. Yun was disappointed to be assigned such a menial task and thought that Boc would perhaps be "too unpredictable" for it. After a few days, Sariss reassigned Yun to investigate a missing patrol squad, and Sariss put Boc on the matter of screamers.
On the planet, Boc was with Jerec and Sariss when they set a trap for Kyle Katarn, which involved capturing his partner, Jan Ors, and bringing her to the Valley Tower. Boc beat her for his amusement. Unaware of all this, Kyle made his way to the tower and was tempted to the Dark Side by Maw, whom he killed defenselessly. Jerec's trap to corrupt the fledgling Jedi had sprung, and the three Dark Jedi emerged from a door. Boc shoved captive Jan forward, with Jerec urging Kyle to kill her and join them. Boc hopped like a fool expecting for the next death. Kyle retreated to the Sulon Star, and Jan tried to reach him, but Boc slammed her down and put his foot on her chest laughing. He offered to run after the fugitive, but the ship fell by itself pushed by Jerec's Force powers. Jerec ordered his three remaining servants to find Kyle and destroy him.

The Dark Jedi discovered the wreckage of Kyle's ship and found him unconscious inside, pulling him out into the night air. He took the lightsaber that Kyle had been using, and with which he killed Maw earlier. It was night when the captive regained consciousness, still paralyzed from the shock and pain, allowing Boc to tease him sadistically. The Twi'lek produced the Jedi's lightsaber tauntingly in front of him, dropped it, and raised a rock above his head. Kyle could only watch in his pain as the Dark Jedi crashed it under the rock, commenting that older lightsabers were better, pointing out that Katarn was not smart enough to build one by himself. Boc's taunts made Sariss tired and sent him to Jerec to report the finding of Katarn and his execution, pointing out to their victim that he shouldn't expect something more welcoming for them, and left laughing with maddening glee.

Boc ended up in the Valley of the Jedi near Jerec harnessing the power of the Force nexus. Jan Ors who was Katarn's partner, friend, and love interest was kept nearby, tied on a column, vulnerable to Boc's taunts and harassments. At dawn, Kyle Katarn entered. Boc had taken the position of a statue, motionless and unseen among the hundreds of Jedi statues that adorned the Valley, and spied on Katarn. Having constructed a mind shield, his presence was concealed by the Jedi's senses. In his thoughts he wondered how the Rebel was still alive, and where were the other two; he got his answer when he noticed that Katarn wore Yun's lightsaber.
It was when Kyle released his partner when Boc revealed himself, offering Jan to "silence" for her the annoying voices inside her head. He ignited one of his lightsabers, and clashed it on Katarn's. Smiling, he told Katarn to send regards to the dead Dark Jedi peers he killed earlier. Momentarily, he ignited his second lightsaber which surprised Katarn and passed right in front of his face. Boc sensed the Jedi's fear and moved forward, weaving patterns in the air with his double bars of humming energy. He felt triumphant but sensed another threat; Ors tried to support Kyle by throwing rocks at Boc. The stones were no match for his lightsaber flurry, nor she for his mental attack and he started to play with Ors by giving her small wounds. But the distraction gave enough time to Katarn who struck Boc with an ancient dark side technique known as spear of midnight black. Boc dropped his lightsabers and moved his hands as if trying to "remove" the spiritual weapon from his chest. He collapsed at the feet of Newar Forrth's statue.
As Boc advanced in the dark side of the Force, his hatred was eclipsed by a profound madness. He spoke with noticeable pauses, often interjecting laughter, and maintained a jocular attitude even in grave circumstances. Despite this, Boc's articulation was remarkably precise, and he could engage in rational discourse, never allowing his deranged manner to compromise his focus on a situation.
The extent to which Boc's personality was genuine insanity or a calculated facade remains unclear. Many perceived his unrestrained emotions as evidence of weakness. Sariss, another of Jerec's Dark Jedi, often barked orders at the Twi'lek with contempt and impatience. In the fleeting moments when darkness clouded Kyle Katarn's thoughts, he dismissed Boc as a mere "nuisance," and even the late Jedi Master Qu Rahn tended to regard the Dark Jedi as crude, lacking "tact and teeth"—in short, ineffective.
Boc, who delighted in tormenting living beings, was always in high spirits when leading a mission, anticipating the suffering he would inflict. He derived pleasure from leading a task force of (mostly xenophobic) humans, wielding absolute authority over their lives without regard for anyone's opinion. His eagerness led him to lead his forces from the front, a trait appreciated by his subordinates, unlike many of his peers.
Boc was appreciative of Jerec's teachings. However, when Yun warned Boc that Jerec would discipline them, Boc dismissed Jerec's threats, believing that Jerec valued his Apprentices, while Yun was more pragmatic.
Jerec clearly recognized sufficient power in the Twi'lek to keep him close, and the deranged Dark Jedi was the final obstacle between Katarn and Jerec. Ultimately, madness was Boc's defining characteristic. Upon realizing that Katarn had dealt him a fatal blow, he laughed maniacally with his final breaths before collapsing.
Boc's lightsaber prowess and Force mastery grew in tandem with his escalating anger and madness. As a practitioner of Form VI, his combat style was described as unconventional and unpredictable. Boc also frequently deceived opponents into thinking he wielded a single, broad lightsaber, when in reality, he possessed two. During combat, the Twi'lek would separate the modified weapon, launching into an awkward, seemingly clumsy, yet deadly imitation of his idol's two-bladed Jar'Kai style. His combat tactics included incessant jumping, making it difficult for opponents to strike him physically, all while laughing and taunting them.
His senses were possibly more refined than those of his companions. During their mission to Sulon, he alone sensed Kyle Katarn's presence and his desire for revenge, a fact that the others struggled to grasp. Besides Jerec, Boc is the only known individual skilled in Force Destruction, a manifestation of the Force fueled by rage. He could also telekinetically throw debris at his enemies. Furthermore, he possessed a limited ability to conceal his presence, both physically and from other Force sensitives, as Kyle Katarn and Jan Ors discovered when one of the supposed statues in the Valley of the Jedi suddenly sprang to life to confront them.

The name Boc Aseca is an anagram derived from the Spanish phrase "Boca Seca," which translates literally to "Dry Mouth."
While the character was rendered using computer-generated imagery in the game, Boc is portrayed by actor Time Winters in cutscenes that appear after completing certain levels.
There exist two conflicting accounts of Boc's official demise. According to the illustrated novella Dark Forces: Jedi Knight, Katarn employed the dark side of the Force to create an invisible spear of midnight black, which he hurled at Boc, resulting in his immediate death. In The Dark Forces Saga, Katarn ended Boc's Jedi aspirations by cutting the Twi'lek down with his lightsaber at the base of the statue.