Unidentified Sangheili Zealot (Circinius IV)
From Halopedia, the Halo wiki
The Zealot participated in the attack on Circinius IV in 2526. Shortly after Covenant corvettes destroyed the planetary space elevator being used to evacuate Corbulo Academy's cadets, this Zealot led a ground assault on the Academy. The Zealot personally initiated the attack by using its energy sword to demolish the school's statue of General Corbulo, the Roman general whom the Academy was named after. The Covenant troops, consisting mostly of Kig-Yar, soon overwhelmed the Marines and ODSTs protecting the Academy.
Once most resistance was neutralized, the Zealot began hunting down the surviving cadets for sport. Under the cover of active camouflage, the Zealot killed Cadet Junjie Chen in the dorms with its energy sword, then pursued the remaining cadets to the weapons locker, where it killed Cadet Walter Vickers with a plasma rifle. The Zealot soon cornered remaining cadets April Orenski, Thomas Lasky, Chyler Silva, and Michael Sullivan, and was about to kill them too when SPARTAN John-117 suddenly appeared from behind and stabbed the Sangheili in the back of the neck with a combat knife, killing him.
Some of the Corbulo Zealot's lines can be heard by enemy Elites during the Halo 4 campaign.
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