Farkas

Farkas is a Nord resident of Whiterun. He is also a Lycanthrope and Member of the Circle, the secret order within The Companions in Whiterun. He serves as the Dragonborn's shield-brother when searching for fragments. Like the rest of the Companions, he is found in Jorrvaskr, which is in the Wind District of Whiterun.

After the Companions questline is completed, the player can go to Farkas for more work. Eventually he will also give the quest Purity to the dragonborn. He is also eligible for marriage after the Companions questline.

Personality
Farkas is very close to his twin brother, Vilkas, and is known for being the stronger of the two. In Kodlak's Journal, Kodlak states that Farkas is kind-hearted and usually follows along with his brother's views in most situations. He also tends to be kinder in his dealings with others. Vilkas tends to joke about Farkas being the more dim-witted of the two. Farkas mentions that Skjor said he had the strength of Ysgramor, while Vilkas had his smarts.

Work to be done
Like Aela the Huntress and Vilkas, Farkas has an unlimited amount of work to be done. Even after completion of the quest Purity, he still has more work for the Dragonborn to complete.

Proving Honor
During the quest Proving Honor the Dragonborn and Farkas are in a ruin. The player is trapped within a cage and Farkas is surrounded by Silver Hand members, determined to kill both Farkas and the Dragonborn. Farkas transforms into a werewolf and kills the enemies.

Purity
Farkas wishes to rid himself of his curse. The Dragonborn has the option of helping him become normal again by throwing a Glemoril Witch Head into the fire and kill Farkas' beast spirit.

Training exploit
After completing Glory of the Dead, Farkas can be asked to join as a follower. In his speech text there should be a listing for both training and looking into his inventory. If both are present, Farkas can train the Dragonborn, then his inventory can be opened and the money taken back.

Remember that there is still a level 90 cap, as with any trainer, even if that NPC is the highest-level trainer there is for that skill.

Trivia

 * "Farkas" means wolf in Hungarian. His brother Vilkas' name also means wolf, in Lithuanian.
 * His default steel armor is randomized as sometimes he will have the set with pauldrons, while at other times he is without the pauldrons. His boots and gauntlets are also randomized between the two varieties.
 * Farkas has a fear of Frostbite Spiders, as revealed during the Glory of the Dead quest.
 * If Farkas joins the Blades, he might travel back to Jorrvaskrr since he is a Companion.
 * Again like his brother, when he becomes a blade, he will say "I'm a Blade now, I can hardly believe it."
 * When in his quarters in Jorrvaskr, against the far wall there is a lute, whether it is there as a prop. It is slightly hinted towards Farkas' voice actor, Michael Popeye Vogelsang, lead vocalist and guitarist for the band Farside.
 * During the quest, "Proving Honor", if you ask Farkas if the Companions are werewolves, after explaining things to you, he will say "It is a secret to everyone", a reference to the well known line from the The Legend of Zelda games.
 * After completing the The Companions Quest Line, it is possible for the Dragonborn to recruit Farkas as a follower.
 * If you finish the Dark Brotherhood contract kill Anoriath before accepting the quest from Farkas about intimidating Anoriath, The Companions Guild will be uncompleteable due to Anoriath being dead.
 * He has the highest skill level in Smithing of all followers.
 * Farkas may be recruited into the Blades.
 * Farkas also has a fear of the undead as he says in Glory of the Dead quest.

Bugs
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Dragon Seekers bug

 * The Dragonborn may experience this bug after the dragon is killed; nothing will happen and there won't be any new dialogue with him to complete the quest. He'll continue to follow the Dragonborn every where and he's immortal (can't be killed - don't waste time) and the quest never ends.
 * Solution: The fix to this bug is to open the console "~" and type . Quest should complete and the follower should be released.
 * Solution: To get away from him, finish a conversation (hit B), then as he is sheathing his sword quickly pause the game (Start or B) and the player is free to travel.
 * As well as this, during Dragon Seekers, there is a known bug in which there is just a floating cursor away from the area needed to kill a dragon in. However, there is no dragon to be seen, causing Farkas to follow the Dragonborn without normal dialogue options.
 * Solution: Unfortunately, the only solution is to revert to save prior to taking the quest, or a temporary fix so he does not interrupt dungeons is to use the Ice Form shout on Farkas before entering. This should make him only continue following you when you exit the dungeon.

Other bugs

 * There is a bug where after the player releases Kodlak's soul from Hircine, each time Jorrvaskr is entered. Farkas will start following the player, open the dialogue box, and unsheath his weapon. This disrupts talking to people, smithing, and combat.
 * Solution: The player can enter a building (other than Jorrvaskr) and he will wait outside, or can kill him outside the city. Killing him without any witnesses, will trigger the courier to find the player and give him/her 300 as directed by his will. Three coins are given to the Jarl of Whiterun as tax, so the player only gets 297.
 * Solution: Alternatively for the above mentioned bug, the console command 'kill' can be used on him which renders him resting on the ground to regenerate. This is confirmed, though the duration is unknown. While he is not a follower, he will be considered essential and not die.
 * There is also a similar bug to the one above that does not need the release of Kodlak's soul in order to get. It is possible to not have started the quest and he will still follow the player anywhere.
 * There is a bug after finishing the Companions quest line, there may not be an option 'I'm looking for work' in the dialogue between the player and Farkas or Vilkas, and there will only be the follower request line available.
 * Solution: A player can solve this by taking a few more Radiant Quests from Aela the Huntress. After that Farkas and Vilkas will give out quests again.
 * There is a bug where if the player attacks the Companions, Farkas will constantly follow, attack, and open dialog with the player, even in battle.
 * Temporary solution: As of right now there is no permanent fix for this, though the Ice Form shout can be used against him so that he won't interrupt for a time. Even defeating him will not stop him from following the player.
 * There is a bug where if Farkas is a follower and the player uses the spell "Clairvoyance," the spell's light will only guide the player to Farkas and not to the objective.
 * There is a bug where if Farkas is left in Dustman's Carin for a long period of time, at least a month, upon returning to the area, he will continually engage in conversation with the player. This will interrupt combat. He will also follow the player anywhere, including prison. Finishing the quest in Dustman's Carin will not fix this.
 * Sometimes Farkas will show up about half-way between Nightgate Inn, and Anga's Mill. He still has the same dialogue options, but will comment that he is "tired of wandering around".
 * If given the wolf armor, after some time it will turn into his default armor. This may happen since he was intended to wear this as his default armor.
 * There is a glitch where Farkas will follow the player around constantly starting conversations with you with his weapon drawn, as if he was a guard attempting to arrest the player. It seems that he is aware of every bounty the player has in Skyrim and this causes the glitch. Waiting or attempting to fast travel while in the same building will cause the error message, "You cannot wait while guards are pursuing." It is possible that Farkas is scripted as a Guard, and will pursue the player until all their crimes are paid for by serving jail time or paying the fines.
 * Solution: If the bounty cannot be removed by serving jail time or paying them off, use the console command  which will result in paying the bounty, but without going to jail or having stolen goods removed. Look up the faction ID for each hold, or do them all if unsure of which cities the bounties are.
 * Solution: To get around the fast traveling restriction, go outside of Whiterun and find the carriage by the stables. This will allow the player to go to the capitol of any Hold and escape Farkas. (If the Dragonborn has a Follower, the bug can be fixed by asking Farkas to become a follower. He will say that he cannot, and then go back to his normal routine. Note: This may not always work). Alternatively, Farkas can be killed.
 * Farkas, as a few of the Companions, has a bug where he behaves as if Skjor is still alive, with dialog stating he is. This may or may not be related to the bug where Skjor actually comes back to life, due to essential characters returning after 1 month game time.
 * If Farkas is still tagged as an essential NPC, he may still pursue you around Whiterun, regardless of his injuries. For instance, if a dremora lord is summoned to kill him, he may be decapitated, resulting in a headless Farkas running around the city. If he is headless, dialogue boxes are open, but not usable.
 * Dropping armor near Farkas will cause him to open dialog, asking if he can have the armor that was dropped. Even if he has permission to keep the armor, he wont pick it up; it'll stay there. Talking to him again will make him ask for the armor once more. This continues until he is told he can't keep the armor.
 * It is likely that Farkas was supposed to wear the Wolf Armor set, as when going on your first mission with him, a Silver Hand will say "he wears that armor, he dies", which was likely referring to the armor as only members of the circle wear it.
 * Like his brother, he is also very difficult to recruit into the blades, as he will intiate dialogue with the player anytime the player tries to speak to Delphine, or any other time dialog is finished.
 * It may happen be possible to can marry Farkas be for the end of the companions questline.
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Appearances

 * The Elder Scrolls V: Skyrim