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"The Hierarchs grow impatient! We can delay no longer!"

- The Arbiter

Warlord Thrall was a Sangheili Commander of the Covenant Army during the Second Battle of Harvest and other Outer Colony campaigns in 2531. He was the Seventeenth Arbiter in the Line of Immaculate Succession.

Biography
As a regular soldier, Thrall suppressed the Sixteenth Unggoy Disobedience and ended the heretical reign of a Kig-Yar Pirate Prince. Later he attempted a coup within his clan on Decided Heart; the coup failed and Thrall was imprisoned in the Weeping Shadows of Sorrow penitentiary. In 2524 (UNSC Military Calendar) the Hierarchs appointed Thrall as the Arbiter and tasked him with conducting the war of extermination against humanity. Thrall was not selected just for his combat record. The Covenant leaders believed the new Arbiter would not ask politically inconvenient questions, an important factor given the secret status of humanity as Forerunner-designated Reclaimers.

Although the Second Battle of Harvest having concluded in the UNSC's favor, only "shadowy information" was retrieved on the Sangheili commander. The Arbiter was present in Harvest's northern polar region, his task close to completion. This involved overseeing excavations of a Forerunner relic. Dismissing concerns from his comrade Zealots, that the relic could be defiled by "the infection" (referring to the human presence, rather than the Flood), he ordered that the relic be opened. Gathering useful information, the Arbiter alerted the Prophet of Regret to the situation, that the Humans were closing in on their location. Regret thus ordered that Thrall return to the Covenant and destroy the relic, the Arbiter bowing to the Hierarch's orders despite his initial objections. The Arbiter seems to show the same reverence towards Forerunner artifacts as the rest of his Elites and is even taken back by the idea of destroying the relic. This order may have been a shock to him (Regret's order also interfered in The Prophet of Truth's plan) After the Battle of Arcadia, the Arbiter was tasked with capturing Ellen Anders. Quickly deploying via gravity lift from an overhead Spirit, the Arbiter grabbed Anders, and made a relatively clean getaway despite a futile attempt by Sergeant Forge to save her. Thrall and his new hostage fled the system and left for an unknown Flood infested planet. Inside the planet's core, the Arbiter used Anders to activate a Forerunner shipyard to build a fleet to destroy Humanity. However the UNSC Spirit of Fire followed them to the planet's core. Forge and a trio of SPARTAN-II's attacked his position, with the Spartans taking out the Honor Guards and Forge attacking the Arbiter. Although Forge was initially overwhelmed by the Arbiter, he was able to trick the Arbiter into coming within knife range, where Forge grabbed his combat knife and stabbed it into the Arbiter's throat. The Arbiter dropped his Energy Sword; Sergeant Forge then picked it up and impaled Thrall with it (stabbed the Arbiter in the stomach), killing him. His body was last seen being pushed off the platform by one of the SPARTANs (Red Team).

Abilities

 * Defiant Rage - recieve additional health for damage inflicted.
 * Spiteful Rage - ability costs less resources.
 * Blinding Rage - increases the Arbiter's and the Covenant's attack power.
 * Additionally, the Arbiter can also summon Kamikaze Grunts.

Upgrades

 * Fiendish Return - allows the Arbiter to reflect attacks back at the enemy.
 * Vicious Blades - increases damage inflicted by the Arbiter.
 * Ghastly Vision - increases Fiendish Return reflection, but also equips the Arbiter with active camouflage.

Trivia

 * Thrall appears as a Hero Unit in Halo Wars, with a special ability called "Rage mode," which allows him to kill several nearby enemies with dual Energy Swords.
 * Out of all the Arbiters that have served the Covenant, only four have been mentioned; this Arbiter will be the second one to be seen on-screen.
 * As an apparent Easter Egg, hint text in the Halo Wars demo claims, "Few people know that the Arbiter's given name is Shirley," referring to the phrase spoken by the Arbiter, "Surely you jest!" in the first level. This Easter Egg refers to the Naked Gun series or from the movie Airplane!, where a running gag is: "Surely you're kidding!?" "I am not, and don't call me Shirley."
 * Thrall lashed out at a Zealot, telling him "I care not for your little life!." Later he struck a Zealot, on the Apex, who was informing him the Spirit of Fire had followed them there. These are examples of his violent and arrogant behavior that led to his imprisonment and subsequently assuming the role of the Arbiter tasked to eradicate Humankind on Harvest.
 * Thrall's energy swords seem to have basket hand guards similar to that of Human fencing swords, over a thousand years in the past.
 * How his armor returned to the Covenant for the next Arbiter is still unknown, as the Shield World's sun exploded destroying the entire construct. It is possible however that the next Arbiter simply wore a new set, thus explaining the differences between the pair, i.e. the mandible guards.
 * His name and rank is a clear reference to Warlord Thrall, the Orcish leader in the Warcraft series.