"The flame of a warrior burns bright in you, Tesar. You have shown that you will never falter or abandon a stricken comrade. May the Force guide you in all you do."
Due to Barabel mating customs, Tesar shared a father with either Bela Hara or Krasov Hara. It was impossible to know which one Tesar could call his sister. Nevertheless, all three were hatchmates and had a sibling-like bond.
Two years into the war, Tesar, his hatchmates, and the Wild Knights entered the war effort in visible fashion. Tesar, Bela, and Krasov made an impression on their fellow Jedi with their impressive coordination and tactics through the battle meld during the skirmish at Froz.
As the threat of the voxyn became clear to the Wild Knights in the wake of Master Eelysa's death, Tesar opted to go on the strike team to Myrkr, and was one of the few who survived. Sadly, both his hatchmates died during the mission.
In 35 ABY, Tesar and the other survivors of the Myrkr strike team received a mysterious Force-call from the Unknown Regions. They set out to discover the source of the call, and found that it was the creature which had once been their fellow Jedi Raynar Thul, believed slain at Myrkr, but now transformed into the Prime Unu of the hive-minded Killikspecies.
Along with Tekli, Alema Rar, Jaina Solo, Zekk, Lowbacca, and Tahiri Veila, Tesar was coerced into joining the Killiks by UnuThul's exploitation of the Myrkr battle meld, and he became a "Joiner"—someone who was influenced and was subject to the control of the Colony, subjected to Force and pheromonal manipulation so profound as to physically affect brain-structure. The Joiners then helped the Killiks to defend their nests against the Chiss. However, Tesar was convinced to return to known space by Luke Skywalker. After the Qoribu Truce, Tesar and Lowbacca went on to hunt pirates hijacking Abaarian water shipments.
Just as Jaina and Zekk came to form a dyad within the Joiner meld, Tesar seemed to grow particularly close to Lowbacca and Tahiri. During the closing months of the Killik conflict, the three of them conspired to reveal Raynar's survival to Aryn Dro Thul, his powerful mother. Tesar and Lowbacca were the ones to tell Madame Thul about the New Jedi Order's possible plans to assassinate her son, because Raynar, as UnuThul, was believed to either intentionally or inadvertently be causing the Dark Nest to keep coming back.
When Luke Skywalker found out what the three Jedi had done, he viewed their actions as a betrayal of their allegiance to the Jedi Order by undermining his attempts to bring unity to the Knights as Grand Master. Tesar and his friends attempted to redeem themselves by telling Luke about Jacen Solo's attack on Supply Depot Thrago, but to no avail. Luke sent them to Dagobah to meditate on what it meant to be a Jedi. He told them that he would call them once he felt they were ready to rejoin the order, and that they were not to leave until they felt that call.
By 40 ABY, Tesar and Lowbacca were operating under Admiral Nek Bwua'tu's command. They were specifically tasked with monitoring the secret Kiris shipyards. Tesar was one of the many Jedi Knights present at the Funeral of Mara Jade Skywalker, where his mother delivered the eulogy. Sebatyne later was part of a huge battle meld at the Battle of Balmorra.
Towards the end of the Second Galactic Civil War, Tesar sparred with fellow Jedi Lowbacca and Zekk against Jaina Solo, in preparation for her coming battle with Darth Caedus, who Tesar had known as Jacen Solo before his fall to the dark side. Tesar was also involved while Jaina learned to control the power of shatterpoints. The war concluded following the death of Caedus, whom Jaina successfully bested in battle.
When Allana Solo saw a vision of Sith attacking and killing all of the Hatchlings, she and her grandparents Han and Leia Solo returned to Coruscant to inform Jedi KnightBazel Warv so he could go and tell the Barabels of the impending attack, but they were ambushed at the secret exit of the Jedi Temple which was lead by Vestara Khai, Jedi Warv died defending House of Solo from the Sith, dying a hero for Allana Solo.