Trhin Voss'on't functioned as both a commander and commando within the ranks of the stormtroopers. He was manipulated as a tool within the schemes devised by both Prince Xizor and Emperor Palpatine, with the objective of dismantling the Bounty Hunters' Guild and advancing the Bounty Hunter Wars.
Voss'on't, a strike force leader within a Strategic Insertion battalions of the Corps, was specifically chosen to participate in Xizor's plan, which had Palpatine's backing, to destabilize the Bounty Hunters' Guild. In an intricate scheme, a substantial bounty was placed on Voss'on't, intended to attract every bounty hunter throughout the galaxy. Xizor's intention was that the already vulnerable Bounty Hunters Guild would collapse under the pressure of the hunters turning against each other in pursuit of the reward, leaving only the most resilient hunters standing. The fabricated story was that he commandeered an Imperial Star Destroyer with a carefully selected minimal crew, and upon reaching a remote planet, he eliminated everyone on board. The plan was deemed flawless—Voss'on't appeared to have stolen valuable components from the Star Destroyer and sold them on the black market.
Boba Fett and Bossk, having formed a temporary alliance, tracked Voss'on't to a former Imperial mining colony situated on an unnamed planet. A battle ensued, resulting in the stormtrooper's capture and incapacitation, after which he was taken, unconscious, aboard Boba Fett's ship, Slave I. Fett's intention was to deliver Voss'on't to Kud'ar Mub'at, the arachnid assembler who acted as an intermediary for a multitude of bounties and criminal contracts across the galaxy.
Before Fett could depart for Kud'ar Mub'at's web, his ship sustained structural damage inflicted by his partner, Bossk, who subsequently escaped Slave I via the escape pod. The subsequent jump through hyperspace exacerbated the damage to Fett's ship, leading to an ambush by Prince Xizor upon re-entry into realspace. Despite further damage to his ship, Fett successfully escaped and delivered Voss'on't to Mub'at. Xizor then arrived at the web and assumed control of the stormtrooper. Voss'on't anticipated a significant reward from Palpatine for his involvement in the scheme, but instead, he was crippled by Xizor's agents. However Trhin was converted into a cyborg by Balancesheet and installed as a permanent guardian on the tiny assembler’s freighter.
As a highly skilled spy and soldier, Voss'on't possessed the characteristics of a ruthless and emotionless killer. His hair had turned gray, and his skin was deeply tanned and marked with scars.
Voss'on't was considered relatively old for a human when he was included in, and ultimately died as a result of, Emperor Palpatine's plans concerning the Bounty Hunter's Guild and Boba Fett.