Bombinax was a male being, specifically a humanoid, who held the rank of lieutenant serving the Queen, a Force-sensitive ruler of the planet Ktath'atn. Like all subjects under her dominion, he was infected by an Abersyn symbiote, an integral component of the queen's hive mind. During 0 ABY (standard year), Bombinax attended a reception held by the Ktath'atn Queen, during which the Jedi Knight Luke Skywalker was presented to her by the archaeologist Doctor Chelli Lona Aphra. Driven by a desire to consume the Jedi, the Queen extended an invitation for them to stay, subsequently tasking Bombinax, alongside her other servants Vespinax and Varroa, with harvesting resources from the hive to prepare her for a potential confrontation with Skywalker.
The following day, Bombinax embarked on a mission to eliminate the Wookiee Krrsantan, who had accompanied Aphra to Ktath'atn but was subsequently quarantined due to the Queen's allergic reaction. On his way, he killed Lord Hossferin, a late arrival to the reception who was insistently demanding an audience with the Queen. Upon reaching the quarantine zone, he launched an attack on the Wookiee. However, before he could deliver the fatal blow, allies of Skywalker from the Alliance to Restore the Republic intervened, infecting Krrsantan with a symbiote. Enraged, the Wookiee retaliated by throwing Bombinax off a cliff outside the quarantine area, resulting in his death.
Bombinax was a male humanoid who acted as a lieutenant for the Queen of Ktath'atn during the Galactic Empire's reign. The Queen held dominion over her subjects, Bombinax included, from the Citadel of Ktath'atn by using a hive of Abersyn symbiotes that were implanted within them.
During the year 0 ABY, Bombinax was present at the Queen's annual reception, where off-worlders would present her with various organic lifeforms in exchange for favors. Bombinax stood guard at the base of her throne as the guests presented their offerings, and he witnessed the presentation of Luke Skywalker, a Jedi Knight, by the archaeologist Chelli Lona Aphra (Doctor).
Initially, the Queen did not find the boy particularly interesting, and Varroa, her speaker, was instructed to reject him. However, after Skywalker utilized the Force to push away an Ezaraa that was confronting Aphra, the Queen's interest was piqued. Dismissing the remaining hopefuls from the reception, the Queen informed Aphra and Skywalker that she would consider their request in the morning, requesting they retire for the night.
Bombinax then accompanied the Queen, Varroa, and another loyal subject, Vespinax, to one of the citadel's balconies. There, the Queen instructed the three to gather the harvest from the other hive members, which they did by inhaling red particulates released from the mouths of the other hive members. The Queen then extracted the collected energy from Bombinax and his colleagues, feeding on all three simultaneously in preparation for combat with the Jedi.
The following morning, Lord Hossferin of the Vandelae system Hossferins arrived at the citadel's gates, demanding to see the Queen and expressing outrage at discovering the reception had concluded. Refusing to be turned away by the Queen's soldiers, Hossferin was relieved to see the higher-ranking Bombinax approaching, believing he might be making progress toward gaining an audience. Without uttering a word, the lieutenant slapped Hossferin with the back of his hand as he passed, knocking the lord over a cliff edge to his doom. Bombinax then killed Hossferin's two guards, punching through one of the pair's chest and out his back.
Leaving the guards' corpses where they had fallen, Bombinax questioned his men at the gate about the whereabouts of Doctor Aphra's companion, the Wookiee bounty hunter Krrsantan. He learned that the Wookiee was being held in quarantine because Wookiees were among the species that the Queen found "disagreeable." Bombinax then proceeded to the quarantine area and attacked the Wookiee. However, before he could kill the bounty hunter, several of Aphra's temporary allies from the Alliance to Restore the Republic and the droids 0-0-0 and BT-1 arrived to save Krrsantan.
Leia Organa (Princess) distracted Bombinax by firing at him with a blaster pistol, while 0-0-0 and Sana Starros dragged Krrsantan to safety. The lieutenant charged at his attacker but was blown back by a shot from BT-1's blaster cannon. This gave the Rebels time to seal one of the quarantine doorways between them and Bombinax, which bought them time to infect their Wookiee ally with an Abersyn symbiote. Bombinax then smashed his way through the door, only to be horrified to find the infected Wookiee inside.
Black Krrsantan smashed Bombinax's helmet and chest armor with his bare hands, then lifted the lieutenant over his head, hurling him to his death over a cliff edge outside the quarantine area. The Rebels and Aphra's crew then rescued Skywalker from the Queen's clutches as she tried to feed on him, before killing the Queen and freeing all her subjects from the hive's control.
Bombinax was a strong, taciturn individual, capable of breaking down a sealed metal door meant to contain Wookiees and punching through the chest of an alien wearing armor with his own armored fist. As a member of the Queen of Ktath'atn's hive, he was infected with an Abersyn symbiote, enabling him to harvest from the lower members of the hive.
Bombinax was conceived as a minor antagonist in the Star Wars: The Screaming Citadel cross-series comic book event. He made his debut in The Screaming Citadel 1, penned by Kieron Gillen, illustrated by Marco Checchetto, and released on May 10, 2017. Subsequently, he appeared in the Star Wars and Star Wars: Doctor Aphra comic book series as the event alternated between the two titles.
Checchetto created concept art of Bombinax, including a depiction of his face, which is never shown in the comics. The art shows the lieutenant as having burns covering the entire left side of his face from the cheek up, as well as a bald head, pupiless white eyes and a black beard. The artist explained in an interview that aside from the dark colors of their armor, he wanted to make them menacing by giving them no irises and cadaveric skin, although this is never visible for Bombinax outside of the concept art.