Syr Tal-Soten was a male Ithorian Jedi Knight who served the Jedi Order near the end of the Galactic Republic's years. During a search for Jedi Master Kirlocca in the Almas Wastelands, he fell victim to the dark side of the Force.
Syr Tal-Soten's Force-sensitive nature was discovered shortly after his birth, leading to his training in the ways of the Force. He progressed through a Jedi Order academy and, after his time as a Padawan, passed his Trials of Knighthood, earning him the rank of Jedi Knight from the Jedi High Council.
Tal-Soten was stationed at the academy on Almas, serving under Headmaster Lanius Qel-Bertuk. He dutifully served the Order and continued his Force studies. In 31 BBY, during an attack on Remembrance Hall by terrorists, Tal-Soten was at the Academy. Qel-Bertuk ordered all Jedi back to the Academy, but Master Kirlocca and his students, located in the Almas Wasteland, did not respond. Consequently, Qel-Bertuk formed a Jedi team, headed by Tantron Dow and including his Padawan Alkin Saad, Jedi Trevon Rey, Seeth'tal, and Tal-Soten, to find and escort Kirlocca and his students back. While traversing the wastelands, Tal-Soten experienced a vision foretelling Master Kirlocca's betrayal of the Order, convincing everyone present of its inevitability. The Jedi had been influenced by a potent surge of the dark side of the Force in the wastelands, causing them to become mentally unstable. After their shuttle crashed in the wastelands, the deranged rescue team continued their pursuit of Kirlocca on foot.
Qel-Bertuk, having lost contact, dispatched a second search team to locate both the first team and Master Kirlocca. This second team discovered the wrecked shuttle, being scavenged by Squib, and stopped to investigate. Inside, they found Padawan Saad's corpse and the confused Duros Master Dow. After calming him, Dow directed them along the path taken by Jedi Tal-Soten and the others in their search for Kirlocca. Arriving at Kirlocca's abandoned campsite, where Tal-Soten's group had killed a Jedi and wounded Padawan Hary'nkel, the Twi'lek girl revealed that Tal-Soten and his group had attacked them, causing the others to flee further into the wastes. Following the sounds of lightsaber combat, the second search party encountered Jedi Tal-Soten fighting Kirlocca and his remaining campers. The search party quickly assisted in subduing Rey, Seeth'tal, and Sal-Toten, all of whom were taken back to the academy for evaluation and possible return to the light side.