Born on the Draconis Combine world of Otho, Trent Arian joined ComStar shortly before the outbreak of the Fourth Succession War. After attending the Sandhurst Military College on Terra from 3027 to 3030, he entered service with the still hidden and secret Com Guards. When ComStar officially revealed the existence of their military, Arian was posted to a unit that saw action in the Periphery and by 3040 he had risen to commanded of a Level III in the 83rd Division (The White Cyclones), successfully mediating unrest sparked by religious hatred on the Federated Commonwealth world of Islamabad. 
Tukayyid and ComStar Schism
When the Com Guards were called to battle the Clans on Tukayyid, Arian received a promotion to Precentor and was given command of the 85th Division (Lions of the Periphery).  The 85th was among those forces deployed for the defense of Kozice Prime, one of the targets assigned to Clan Diamond Shark. After several days of intense fighting, the 85th was mauled with third of the division destroyed, though the Shark force was reduced to only two survivors. The surviving units of the 85th managed to disrupt the supply lines of the Sharks' Gamma Galaxy, but were wiped out in the process, despite the arrival of the 2nd and 5th ComGuard Armies.  Precentor Arian was shot out of his BattleMech twice during the battle and badly wounded, but steadfastly refused to retire from the field until last of Diamond Sharks withdrew from the planet. Arian won the Precentor's Sword for his actions. 
Upon returning to Terra for rest and refit, he learned of the death of Myndo Waterly and the reformation and secularization of the Order. He promptly took more than thirty MechWarriors and their equipment back off-planet and headed for the Free Worlds League where he pledged his loyalty to the Word of Blake.  Despite their philosophical differences, all Word of Blake factions realized that the number of refugees coming from the ranks of the ComGuards made a Precentor Martial necessary for their organization, as nominal commander of the largest single group of refugees Arian was promoted to that position. 
Word of Blake Militia and Operation Odysseus
One of his first actions was to order the mass production of several new BattleMech designs to provide equipment for the large number of 'Mech-less warriors flocking to their banner, including the Grand Crusader which was to become his signature 'Mech.  Many in the Inner Sphere attributed the success and quick expansion of the Word of Blake Militia to Arian’s direction. 
His skill and determination bore fruit in 3058, when the Word of Blake was strong enough to launch Operation Odysseus: the invasion and conquest of Terra. Through deception and military skill, the Blakists’ successful assault on the cradle of humanity took a mere nine days, with Arian himself participating in the final stages of battle at Sandhurst Military Academy. Trent Arian was named governor of Terra and proceeded to reverse the many changes instituted by the secular ComStar as the Word of Blake moved increasing numbers of troops and personnel to the planet. 
Death and Legacy
While the successful occupation of Terra won Trent Arian much praise, it also earned him a great deal of internal and external enemies. A number of ComGuard survivors had begun guerrilla actions against the occupiers and as governor, Arian was a prime target, surviving a number of assassination attempts. He also expressed a disdain for the political maneuverings that infected the Word of Blake’s inner councils and tried to keep himself out of the infighting. Increasingly seen as too "soft" by the Blakist sects who desired a more proactive and militant Precentor Martial, he began to grow wary of Cameron St. Jamais, the leader of the radical Toyama Sect faction. 
In 3061 while on his way to a memorial service to commemorate the anniversary of Primus Myndo Waterly’s death, Arian and his aide, Suzanne Mulvanery, were killed instantly by an assassin’s bomb.  While Word of Blake investigators tracked the explosive device to a ComGuard insurgent, members of the Sixth of June performed the assassination to allow Arian’s rival and their fellow Sixth of June member Cameron St. Jamais to be appointed Precentor Martial in his place.  
Philosophical and political views
While a quiet man, appearing at times indifferent or even bored, his demeanor masked a sharp and attentive intellect. Despite spending most of his adult life as a soldier, Trent was acutely aware of the dehumanizing effect of battle on warriors and feared that in particular his troops would allow their hatred for their ComStar brethren to overcome the more noble aspects of their profession when they finally met in combat. 
Similarly, Arian greatly desired to minimize civilian casualties during battle, he disliked putting civilians in harm’s way and tried to avoid such situations whenever possible. Many times, when uncomfortably reminded of the horrors of war, he would gently touch his right shoulder, which had been injured during the fight on Tukayyid and served as a constant reminder of the price that war extracted from its victims. 
While seeking to avoid the political infighting that beset the Word of Blake, Arian’s beliefs were closest to those of the moderate True Believers. His moderate leaning and high position earned him the ire of the more militant factions and resulted in his assassination. 
- The Fall of Terra, p. 66
- Tukayyid, p. 69, "Campaign: Clan Diamond Shark"
- ComStar, p. 94, "Blake Guard/Word of Blake Militia"
- The Fall of Terra, pg 7-11
- Field Manual: ComStar, p. 4, "Voice of the Resistance"
- Field Manual: ComStar, p. 46, "Word of Blake Militia - Recent Events"
- Interstellar Players, p. 16, "Sixth of June"