From Destinypedia, the Destiny wiki
The Fanatic's Chosen are powerful Scorn allies of Fikrul. Towering over even the highest of Chieftains, they serve as priests and generals of the Scorn army. They are first seen during the mission High Plains Blues to put down The Spider's associates and their Guardian back-up. After the events of Forsaken, they patrol the Dreaming City commanding what's left of the Scorn.
As of the launch of Forsaken, there's no indication of whether the Fanatic's Chosen will spawn or not. Usually, it could be seen right as the player spawns into the Divalian Mists, where it could be viewed fighting the Hive and Taken. Unlike other High Value Targets, the Chosen is considered an Ultra, meaning that it bears the ability of a boss melee as well as considerably more health. When encountering it, it will continuously fire at the player while attempting to reach the despawn area. Occasionally, it will summon one of the three types of tools, whether Void, Arc, and Solar, all having different abilities. Killing the enemy rewards the player with a chest full of loot.
List of Appearances