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Fimbul was one of Azog's master hunters in the Hobbit and the right hand of the vile Yazneg, who led the orc hunters after Thorin Oakenshield and his band of dwarves. Fimbul later becomes Azog's second in command after Yazneg is killed by Azog himself for his failures.
Fimbul can first be seen along side Yazneg in the Lone Lands at night while Fili and Kili joke about a midnight raid by Orcs, as the Orc hunters watch Thorin Oakenshield and his group from a distance, Fimbul is then ordered by Yazneg to report the dwarves location back to their Commander, Azog. Fimbul later accompanies Yazneg and numerous other orcs and Wargs on an attack on Thorin's group they are however led astray by Radagast the brown, using his rabbit pulled sled, who is acting as a distraction for the dwarves. However Yazneg is able to detect the Dwarves hiding in a small crevice and proceeds to attack until Elrond and his elvish warriors arrive and slay many of the Orcs and Wargs causing Yazneg and Fimbul to flee.
Fimbul is with Yazneg when they travel back to Weathertop, where the Orc hunters have made their base, it is here Yazneg reports the dwarves' escape, to their commander Azog the defiler. Fimbul then watches with horror as Azog kills Yazneg for his failures, . After Yazneg's death, Fimbul succeeds him as Azog's second in command of the Orc Warg riders and rides by his commander's side as he leads the hunt for Thorin Oakenshield and his company of Dwarves.
The Orcs eventually catch up to the Dwarves after the latter's narrow escape from the Goblin Town and force the Dwarves to climb the surrounding trees to escape the vicious wargs. Soon after Thorin is critically wounded by Azog but is rescued at the last minute by Bilbo Baggins, who is then surrounded by Fimbul and many other hunter orcs who, on orders from Azog, attempt to kill the small Hobbit, but are ultimately halted by the arrival of Eagles who proceed to kill many of the Orcs and Wargs present before rescuing the stranded and outnumbered party of Dwarves as well as Gandalf the Grey and Bilbo. Fimbul survives the Eagles' attack and is last seen at Azog's flank as he screams in anger as his plans to finally sever the blood line of Durin were thwarted.
- Golfimbul, the Goblin whose name Fimbul's seems to have evolved from.