Lights of Sanghelios

Honor Guard Ultra is a Covenant Sangheili rank. This rank commands the 'lower' Honor Guard Elites that protect the High Prophets. This rank is still equal to the rank of Brute Honor Guard since the Brute Honour Guard only has one rank within it. They are part of a special unit called the Light of Sanghelios.

They are likely more skilled than their subordinates, with many years of experience in the Covenant Honour Guard, which is particularly impressive considering the prodigious combat abilities of any in the Honour Guard.

Class
These Honour Guard Elites sport the same ornate armour, as the rest of the Honour Guard, with the exception that their under armour they wear is white instead of crimson red. This colour is consistent with the Ultra Elites of the regular Covenant army, hence their title.

Combat
Honour Guard Ultras have never been directly seen in combat. A lot of players believe that one appears at the end of the level Gravemind but this Elite is actually the glitch known as the "Honor Guard Councilor".

Five Honour Guard Ultras are seen in the cinematic of Sacred Icon (Level) when they, along with regular Elite Honor Guards are stripped of their position, giving it up for the new Brute Honor Guards. One is seen giving his helmet to a Brute.

In addition, three Honour Guard Ultras are seen to be killed fighting the Brutes around the middle of the level Gravemind (Level). They wear Honour Guard armour but without helmets, as they no longer held that position when they were killed.