Black priest

"'What are those guys?!'- Federation Trooper during the Grey Point massacre "

The Black Priest are a religious cult within the Khoan/Resurgent / and Immortal Empire's. The Black Priest are a elite force of warrior's and soldiers, that are tasked with protecting the Empire and the Empress/Emperor from  threats both internal and external. During the Resurgence and Immortal Empires,the Black Priest were used on the front lines as shocktroopers, striking fear and despair in the hearts of their enemies. Under orders of Darth Mauler the Black Priest were entrusted with protecting the royal family, and eliminating any and all opposition to Mattock-Ko's daughter Anita. During the coup against the Council of 5 a human member named Senya-ya Kari gained recognition and renown especially since she protected Anita from Jedi assassins.

History
The Black Priest guards, were formed by  various Khoan tribes and clans using their elite warriors as bodyguards for the Warlord's.  The Black priest evolved and combined with the Khoan Religion which was centered around the worship of flesh hungry, bloodthirsty gods*. (Many of the modern clans were named after these gods, such as Five Talon/ Gorda, Black Blood/Demgo, and Hydra/Hydra).

The Black Priest were and are not force sensitive, the reason for their increased strength, agility, and durability and apparent immortality   came from their rigorous  training, which includes live matches between initiates and beast, and prisoners of war.