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Tiernan Larkin was born in Kenmare, Ireland to James Hunter and Caitlin Larkin. The younger half-brother to Jonas Hunter, Tiernan always felt that he played second fiddle to his older brother for his father's affections. After his father's untimely murder at the hands of several local thugs Jonas was sent off to an orphanage by his step-mother (who also felt scorned by her husband's devotion to his son), however Tiernan never recovered from his father's violent death. Eventually earning a reputation in his hometown as a bully and a brute and constantly running afoul of the local police force Tiernan began to believe the world was out to get him and started to lash out at those around him.
Shortly after graduating high school Tiernan's mother Caitlin died in an accident and Tiernan decided it was time to start off new. Moving to Dublin, Tiernan joined the local Fire Brigade and for a time led a very successful life in the city. However eventually Tiernan's darker side began to take root in his new life, first by driving off those who dared to get close to Tiernan and eventually began interfering with his work, resulting in his termination from his post at the firehouse.
One drunken night in a local pub Tiernan was greeted by someone who seemed to know a great deal about him (Arkady Tsepes). This stranger indulged Tiernan's drunken rants and validated much of what was spoken- all of Tiernan's problems were a result of his older brother, Jonas.
Waking the next morning Tiernan found himself in an unknown place. Exploring his surroundings it became quite apparent to him that he was no longer in Ireland. Meeting up with the stranger from the night before Tiernan was told he would be given a chance to reclaim his life from his brother. Arkady explained that at one time Jonas worked for him but subsequently mutinied against the Illuminati and had begun poaching several of his allies from the organization. Stating that he needed a new enforcer Arkady offered the job to Tiernan who graciously accepted the opportunity.
Tiernan was introduced to the details of the vampire civilization and was subsequently turned by Malcanthet, the Sovereign of the Chimerae. Joining the Covenant as Arkady's eyes and ears within the organization Tiernan began training with the other Chimerae and secretly meeting with Malcanthet and receiving Demonic infusions of power to augment his own natural strength and durability.
Soon Tiernan was powerful enough for the Three Vipers to begin using him for their own ends. Sending him out to acquire the Demon's Eye from the Pazitori in Eastern Europe, Tiernan proved himself to the Vipers by slaughtering the entire clan (save for one young woman who wasn't in camp at the time) in pursuit of the artifact. Returning triumphantly Tiernan was accepted into the inner circle of the Covenant.
During Arkady's Ascension Ceremony OMEGA (led by Jonas) interfered and not only was able to kill both Malcanthet and Xi Zhou Chen but also overpower and kill Arkady Tsepes despite his success in bonding with the Demon's Eye. After the battle Tiernan returned to the site of the ceremony and retrieved the bodies of Malcanthet and Xi Zhou Chen, knowing their demonic grafts would allow them to be reborn in the proper conditions were met.
Thanks to his heritage (descendant of Azrael on his mother's side) and his proximity to the battle, Tiernan was soon overcome by the soul of Azrael as it infused with him. Unfortunately for Tiernan the soul of the Angelus was not pure, but instead tainted by the corrupted essence of the demon general Belial. Feeding on his hatred and his demon infusions Belial's influence was able to overpower Tiernan's psyche, resulting in Tiernan beginning to call himself Testament.
Testament soon received word from his allies within the Covenant that OMEGA had called a meeting with the new Sovereigns of the Bloodlines in an attempt to broker peace among the vampires. Knowing that he needed to strike quickly Testament was able to discover the location of the meeting and crash the summit on the last day of the meeting.
Wielding the power of the Demon's Eye, Testament ascended to his own version of Melachim Form, and wreaked havoc among the participants. Still reeling from the battle with Arkady and unable to ascend himself, Jonas was no match for the brute strength of Testament. Knowing this, Testament released Jonas with the knowledge that he could come for him at any time. After the attack the summit quickly dissolved as each side accused the other of bringing Testament to the meeting to interfere in the peace talks.
After the peace summit Testament began a two-fold mission:
Travelling to the abandoned demon city Necropolis in modern Thailand, Testament was pleasantly surprised by what he found there- a crypt filled with demon-tainted Strigoi. Able to exert his will over the insane strigoi Testament was able to quickly create the army necessary to stand against OMEGA and its leader, Jonas Hunter.
The opportunity to make headway on Testament's second objective came during a raid on a den of stray strigoi in London, England. Responding to a sighting of strigoi in London OMEGA dispatched a team led by Slayer to look into the situation (at the time OMEGA was unaware of Testament's connection to the Strigoi). As both Testament's warriors and OMEGA were tracking the strigoi the two teams came into conflict. Surrounded by ravenous strigoi Slayer was quick to broker a deal with Testament, in the process sacrificing his human teammates to the strigoi.
Sending Slayer back to OMEGA as a double operative, Testament was able to keep an eye on the inner goings of the organization and quickly learned of Jonas' quest to enlist the assistance of other "Prodigals". Interfering as best as he could without it becoming obvious that he had eyes inside OMEGA, Testament was able to successfully cull several existing Prodigal vampires into his forces (including both Anton Wilk and Oblivion) before Jonas knew any better.
Eventually learning of Jonas's plan to return to Enoch to claim the Reaver Testament instructed Slayer to accompany Jonas on the trip and to betray him once they reach the city. While in the city Slayer was to free and collect the essences of both Lilith and Asmodeus and return to Testament. Slayer was largely successful in his ruse however Jonas was able to discover Slayer's ploy prior to him completing his mission. As a result Slayer retreated to Testament's ship after releasing only the essence of Lilith, leaving the essence of Asmodeus within the Stygian Vaults.
Knowing that he would have to find a host for Lilith’s essence Testament began searching for the woman who would become the new Mother of All Demons, eventually setting on Jillian Morningstar, one of the leaders of the Ordo Divinus Venatorum in the Vatican.
Knowing that Jonas was aware of the buildup of strigoi forces in Italy Testament intentionally leaked information regarding a supposed demonic artifact buried in the Vatican catacombs. Jonas would then assume that Testament himself would enter the catacombs to claim the artifact and would deploy his most powerful forces within the crypts to protect the artifact. Instead Testament sent a large contingent of strigoi under the command of Slayer into the catacombs to distract Jonas and OMEGA while he slipped into the headquarters of the Ordo Divinus Venatorum unnoticed.