The subject of this article or section originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
When Azog the Defiler paid homage to the Necromancer of Dol Guldur (Sauron), a pact was made in which Azog would bring the armies of the Misty Mountains forth to conquer the North of Middle-earth and to revive the ancient kingdom of Angmar. During the quest to reclaim Erebor from the Dragon Smaug, many of the larger Moria Orcs met at the sorcery hill within the center of the stronghold and began to forge weapons and armor to prepare for war in the east region of Rhovanion. After Gandalf was imprisoned by Sauron, the assembled force of orcs set off towards the region of Erebor, to wage war on the unsuspecting Dwarves, Elves, and Men, currently there. Like any other foul breed of orc, the orcs brought along terrible creatures of war with them. Huge and monstrous war trolls, as well as flesh starved wargs joined the massive orc host.
During the Battle of Five Armies, Azog's host of 30,000 Guldur Orcs clashed with the allied forces in the valley of Erebor, and within the streets of the ruined city of Dale. During the day long fight, thousands were slaughtered at the hands of these orcs, the battle only being won when Thorin Oakenshield killed Azog at the precipice of Ravenhill, thus cutting off the commanding head of the orc army. The orc army was thus defeated, and lost a considerable amount of their forces: only a few hundred to about a thousand managed to escape the battle.
These huge creatures were brutal, vicious, bloodthirsty and "bred for war". The Guldur Orcs were heavier-built and larger than the orcs that inhabited Moria during the War of the Ring, though some of them wear the same helmets. Most were hive-minded brutes that worked directly under the orders of the one currently in charge of their forces. When their leader was killed, they would completely lose all methods of strategy.
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