Reff and his brother Thon were both born on Sanghelios in the city-state of Thasanee. The former was considered to be weaker than most Sangheili males, but Thon saw something special in him and watched out for him his entire life.
Line Installation 1-4
When the two brothers joined the Covenant, Thon rose through the ranks to becoming Shipmaster of the Covenant assault carrier Clarity of Faith, with Reff as his second-in-command. While attempting to rendezvous with a supply convoy in Sub-Sector 35, the ship picked up a transmission that displayed a Pi-constant, a system not used by the Covenant or the humans. Reff eagerly took this to be a message from the Forerunners and a sign of the Great Journey and insisted that they must investigate. However, Thon ignored his fanatical brother and ordered Clarity to make a Slipspace jump. When they jumped, there was a sudden burst of energy that sent the Clarity crashing down onto a desolate moon. Again, Reff jumped to the conclusion that the Great Journey was about to start. Thon slammed his brother against a bulkhead and scolded him for speaking heresy. He further warned that if Reff ever interfered with his command, he would personally gut his carcass.
Donning Ranger armor in order to explore the airless moon and scouting out the landscape in a Wraith, they encountered a team of Spartans and engaged them. Their fight was interrupted by the arrival of a few Gatherers, which captured Reff, a Mgalekgolo, an Unggoy and Spartan Black-One and brought them to Line Installation 1-4. The captives were deposited into separate holding cells. Reff offered to teach Black-One about the Journey in their final hours, which the human politely declined. They were all addressed by the Monitor of the Installation 686 Ebullient Prism, who said that he needed their help in researching immunity to the Flood, intending to dissect them in the process.
Reff was horrified that he was doomed to be torn apart. Black-One told him to pull himself together. Their conversation was interrupted by the return of Prism, who turned his eye on Black-One. Reff pleaded before the Monitor, stating that the human didn't believe in the Journey. Prism was more fascinated with Reff's rudimentary understanding of protocol and instead dissected the Unggoy, before moving on to deal with some "unauthorized" presences inside the Installation. Black-One reaffirmed his attention to make her death quick and painless, to which the Monitor was more than glad to accomplish. However, it was a trick, as Black-One used her helmet to deflect the lasers at a nearby Gatherer, hitting her space mag clip, causing the machine to crash into her cell. Grabbing its weapon, she used it to free Thon before they fled from Prism. As they were chased through the halls by Prism and his Sentinels, Black-One was knocked down by a Sentinel's energy beam.
Reff retaliated by grabbing a Sentinel weapon and damaged Prism's eye, declaring the Monitor to be a "false Oracle". They then eluded him in the Installation's central control chamber. Inside, Reff contacted Thon, who had temporarily allied with Team Black, to guide him to his location. But once his brother arrived, he had Black-One slammed into the control console. Seeing a holographic display of the supply convoy they were suppose to meet, Thon said that they must contact High Charity to receive assistance in securing the Installation.
However, Reff instead proclaimed that they must up the Installation's weapons to blow the Hierarchs' servants out of the sky, claiming that it was destiny that he was brought here to build a "new Covenant". Thon scolded him for such thoughts, reminding him that it was only because of him that he had made it this far. Refusing to tolerate him anymore or stain their family name, Thon chose to commit fratricide against his own brother. However, Reff grabbed Thon's energy sword and impaled his brother with it. Soon after, Prism had returned with a swarm of Sentinels and Gatherers, demanding that Reff step away from the console. Reff refused to listen, stating that it is he who shall unite both Covenant and human together on the path for the Great Journey. In response, Prism vaporized Reff from the legs up.
Reff is described as somewhat fanatical, particularly in contrast to his pragmatic brother. He took any event that was out of the ordinary to be a sign from the Forerunners. But unlike most Sangheili, he was open-minded enough to offer to convert a human to following the Covenant doctrine. However, his experiences on Line Installation 1-4 appeared to have driven him insane in the end.
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