Lord Xanak Grunseit was a male Falleen who operated within the criminal organization known as Black Sun, and he was the great nephew of Xomit Grunseit, the syndicate's former leader. Around 3 ABY to 4 ABY, Grunseit held the position of cousin to the current head of Black Sun, yet he considered himself the true leader. During this time, the Hutt Clan issued a death mark for Grunseit. Boba Fett, a bounty hunter, plotted to collect the bounty on Grunseit, however, he was secretly employed by the Falleen's cousin and promised the bounty hunter T'onga the location of a cyborg fixer in exchange for her and her crew's help in assassinating Grunseit. Simultaneously, Grunseit discovered Fett's intention to collect the bounty on him and, in response, placed a bounty on Fett himself. To carry out their mission, Fett and the crew traveled to Quantxi, the junk moon orbiting Ord Mantell, where they encountered Grunseit and several Black Sun gangsters, creating the appearance that Fett was captured by the crew. Grunseit then betrayed the crew, never intending to pay them for delivering Fett and surrounding them with E-Web heavy repeating blaster cannons. Fett then revealed his allegiance to Grunseit's cousin by throwing a ball of fast-acting neurotoxin called Syntox at the Falleen, which was lethal to their species, and stated that he only needed to be in close proximity to deploy it. Ultimately, the neurotoxin caused Grunseit's death, and the hunters eliminated the remaining Black Sun forces.