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Why is a disgrace for the Elites to become the Arbiter? On Halo3 it seems that he is the boss of all the Elites.
The title of Arbiter is the highest possible honor bestowed upon a Covenant Sangheili by the Hierarchs during a time of need. It is the greatest religious rank of the Sangheili, although councilor rank higher in political matters. The Arbiter acts as a sort of field general, going on missions for the Prophets and during incidents such as the Taming of the Lekgolo, the Unggoy Rebellion, Human-Covenant War, and most recently, the threat of the heretics led by the Sangheili Sesa 'Refumee.
Arbiters are sent on highly perilous and suicidal missions in times of need. On these missions, the Arbiter is expected to die and to become another great martyr of the Covenant on their path to the Great Journey.
Is you have ever watched Halo: Legends then the episode "The Dual" shows the following.
Originally, the title of Arbiter was given to the commander of the Sangheili military, and was considered a great privilege among the Sangheili. However, at some point between 2142 and 2525, the contemporary Arbiter, Fal 'Chavamee, refused to accept the Covenant religion and was branded a heretic by the Prophets. The resulting chain of events, which led to the deaths of both 'Chavamee and a high-ranking kinsman named Haka, led to the Prophets changing the role of the Arbiter significantly. The title was thereafter given to disgraced Sangheili in order for them to regain their honor by way of suicidal missions of great importance to the Covenant as a whole.
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