Birth of the Arbiter
The rank of Arbiter was not always given to disgraced Sangheili, but was once the highest attainable honour for one. There could only be one Arbiter at a time, a seasoned veteran of many battles (and victories). It is the greatest religious rank of the Sangheili, although the Sangheili High Councilor is considered to have superior political and military status. But this was before the time of Fal 'Chavamee, the last Arbiter of this kind.
Fal 'Chavamee was a member of the Covenant military roughly 4 centuries before the start of the Human-Covenant war. He was not only the Arbiter at the time, he was also the leader of the 'Chavam clan on Sanghelios. On Sanghelios, he served as a military trainer and supervised many of their trainings. However, he believed that his people had strayed from their honour and fought only for power. He denied the Great Journey, proclaiming it to be a lie. For his disbelief, he was declared a heretic.
As Fal was declared to be a heretic and should be killed, Haka, a member of Fal's clan, stepped up. Believing that what he did was righteous, he had Fal's wife killed by Fal's close friend Roh. Fal made his way to where Haka was located, but was halted by an entire Covenant Army. As the Army noted him, all the Sangheili began to chant "curse the Arbiter" before charging the lonely Arbiter. Fal then turned on his Energy Sword and charged the Army, as it charged him. He then proceeded to kill Sangheili until his Sword ran out of energy. He then disarmed two Sangheili and took their Energy Swords, which he continued to use in a spinning formation. In this way he killed many Sangheili and Kig-Yar.
He was then assaulted by two Ghosts and a Wraith. Dodging their attacks, he came across three gigantic Mgalekgolo. After first dealing with the Wraith, he then ran up a Mgalekgolo's back and killed it with a single Energy Sword thrust in the neck. He then looked up and realised that the rest of the army had fled.
When Fal finally met Harka atop a Forerunner structure, the duel began. It only lasted for several seconds. The Sangheili circled each other for a bit and then, in the blink of an eye, attacked. Fal's whole upper torso was slashed open, gushing blood out, while Harka was stabbed in the midsection. They both died by each other's hands, with Harka collapsing first. Fal's last thoughts before dying were the memories of his wife.