The Servants of the Flame (Orc."Ghâshûli") were an order of superstitious Orcish mages and shamans in Moria, branched off from the Cult of the Eye.
A collective of cheap conjurers, unimpressive healers and tribal-priests, the Servants of the Flame' fascination with the occult and the powers yielded by working with Morifaire was a by-product of the primitive intelligence that had been the grounds for their ancestors' faith in the Dark Powers: to Orcs, a deity was the embodiment of tyranny and destruction, and it was to be venerated and feared in equal measure. That same primitive intelligence had led the Servants of the Flame to add another god to their pantheon, just besides the "Old Master" and the "New" one: the "Flame", that is the Flame of Udûn that lurked within the depths of Moria.
Though Sauron and some of his chief agents, such as the Nazgûl or Saruman, had not refrained from sharing unholy knowledge with a select class of Orc spellcasters (called "Dush"), the appetite of the Servants of the Flame for mystical power had not been quenched - regardless of the fact that Orcs were not as magically adept as Men or Elves. Instead, they dared to directly commune with the Balrog - although some were burned to ash for disturbing his rest, others were more fortunate to catch the creature in a more benevolent mood and were offered what little knowledge in the mastery of fire their minds could accumulate in exchange for paying it homage. This they did by gathering a following of hapless dim-witted acolytes which they often dedicated as sacrifices via immolation to their god. The Servants of the Flame conceded to the bargain. Dreaded and begrudgingly respected by the other Moria Goblins as direct emissaries and conduits of the Balrog's power, they gained quite a reputation among the Orcs of the North. It seems the Servants of the Flame encouraged their brethren to join them in fearful deference to the Flame; clues can be found to support this in the Moria Goblins' armor, helms and weapons, which bore great resemblance to the Balrog's appearance. Be that as it may, the Servants of the Flame had more than one lord and master; the arrival of a contingent of Black Uruks sent out of Mordor to bring some 'discipline' among the scattered tribes of Moria Goblins reminded the order of that. The Eye was willing to show leniency to their 'heretical' side practices as long as the Servants of the Flame acted out his will, harnessing the power bestowed upon them by the Balrog in service to Sauron and rallying the denizens of Moria to the cause of Mordor. The Servants of the Flame preached (amidst the screams of their sacrifices), to their followers that the 'time of the King', the Long Night was near and that the World would soon burn and then be covered in Shadow. The Goblin shamans eagerly awaited that time; and if some heretics didn't, suffice to say the Uruk overseers would see that a few heads rolled.