Trevon Rey was a Jedi Knight of the Human species, a male who served the Jedi Order as the Galactic Republic neared its end (its final years). While on a mission to locate Jedi Master Kirlocca within the Almas Wastelands, he succumbed to the influence of the dark side of the Force.
Trevon Rey's Force-sensitive nature was identified shortly after his birth, leading to his removal from his home planet for training in the ways of the Force. After completing his time at a Jedi Order's academies and succeeding in his Trials of Knighthood following his time as a Padawan, Rey was granted the rank of Jedi Knight by the Jedi High Council.
Assigned to the academy on Almas under the leadership of Headmaster Lanius Qel-Bertuk, Rey dutifully served the Order while continuing his Force studies. In 31 BBY, Rey was present at the Academy when terrorists launched an assault on Remembrance Hall. Master Qel-Bertuk commanded all Jedi to return to the Academy; however, Master Kirlocca and his students, situated 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 Rey, Seeth'tal, and Syr Tal-Soten, with the mission of finding Kirlocca and his students and bringing them back to the academy. As the team traversed the wastelands, Tal-Soten experienced a vision foretelling Master Kirlocca's betrayal of the Order, convincing everyone present of its inevitability. The Jedi had, in fact, been influenced by a potent surge of the dark side of the Force prevalent in the wastelands, leading to their collective derangement. After their shuttle crashed in the wastelands, the mentally unstable rescue team pressed on foot in their pursuit of Kirlocca.
Losing communication with the initial team, Qel-Bertuk dispatched another search party to locate both the first team and Master Kirlocca. The second team came upon the wreckage of the shuttle, which was being scavenged by Squib salvagers, and paused to investigate. Inside, they discovered the body of Padawan Saad and the disoriented Master Dow, a Duros. After calming the frantic Jedi, he directed them along the path taken by Jedi Rey and the others in their search for Kirlocca. Arriving at Kirlocca's abandoned camp, where Rey's group had slain a Jedi and wounded Padawan Hary'nkel, the Twi'lek girl revealed that Tal-Soten and his companions had attacked them, causing the others to flee deeper into the wastes. Following the sounds of lightsaber combat, the second search party encountered Jedi Rey in the midst of battle with Kirlocca and his surviving followers. The search party swiftly assisted in subduing Rey, Seeth'tal, and Sal-Toten, all of whom were subsequently transported back to the academy for assessment and potential liberation from their struggle with the dark side.