From Destinypedia, the Destiny wiki
Highguard, Salvation Elite are a class Elite of Fallen from the House of Salvation. Among their ranks are Captains, Vandals and Marauders, where the Captains wield a Shock Rifle, while the Vandals and Marauders wield a Molten Welder and Shrapnel Launcher.
They appear in the Asterion Abyss apart of the Salvation platoon and need to be defeated to lure out their commander, Elenaks.
A Highguard Captain
A Highguard Marauder
A Highguard Vandal