The Screams of Brahmin (quest)

 is an unmarked quest in Fallout: New Vegas.

Something has been killing Brahmin at night in Novac. No-Bark Noonan says he saw an invisible monster doing the killing. Stake out the pens at night and find out who's to blame.

Quick walkthrough
Speaking to No-Bark Noonan in Novac indicates the player should speak to Dusty McBride, whose Brahmins are being killed on his ranch. Dusty informs the Courier they should wait in his ranch in Novac at midnight. You will see the attacker is a crazed Nightkin. The Nightkin carries a message entitled The screams of brahmin. Upon completing the quest Dusty will inform the player they can have access to his Brahmin Steaks in the freezer. Additionally the courier will gain Reputation with the town and positive Karma. Also for an added bonus, the Nightkin will have a Minigun.

Video walkthrough
You can find a video walkthrough at Gaming Drunk.

Bugs

 * Even after you kill this Nightkin and complete the quest he can come back to life at a later date and stand cloaked and motionless near the train track. Targeting him in V.A.T.S will remove the cloak but he will not react or attack. Novac NPC's will completely ignore him, even if you push him into the center of town.


 * Sometimes the Nightkin will not attack the Brahmin but only stand there cloaked unless he was recently attacked possibly by a Glowing One, if this happens, the Nightkin is in front of the house at night, or during the Day he is found behind a rock next to a broken fence, but if it is killed without seeing it as it is killing the Brahmin, the quest will be uncompletable.


 * You can actually complete this quest after you kill the Nightkin as in the above description. When you come here later you will find him alive standing behind the fence and after killing him again you will be able to end the quest by talking to the quest giver.


 * Another alternative is to try standing near the Nightkin while it's cloaked during the day (behind a nearby rock) and use the wait function to fast forward until around midnight. After a few moments, it will hopefully pull out its minigun while still invisible, and proceed to attack the Brahmin.


 * CAUTION: If you leave this quest for too long after finding it, the Nightkin may end up killing all the cattle while you're away, or in a different part of the area. It is unknown whether the ranchers will acquire more cattle if they run out.


 * Talking to No-Bark about this quest or talking to the people about the Boone quest may cause the quest to become uncompletable


 * You can also try to finish the quest with Boone and then do the ranch attacks quest. I was having trouble getting the nightkin to attack the cows before I did any Novac quests, but after I finished Boone's quest and Come Fly With Me, I tried the ranch once more and this time he did attack the Brahmin. There might be some conflict between either Boone's or Come Fly With Me, or both, but after finishing them, it worked.
 * If you kill the Nightkin before he uncloaks himself and kills a Brahmin the quest may not be completable even if you retrieve the note
 * You may try to fully exit the game then do a fresh load from before the Nightkin attacks. Sometimes reloading doesn't reset the AI properly so only a load from a newly opened application works. (Pretty much the same thing to do with missing weapons from dead bodies, you'll need a fresh load from newly opened application to spawn the weapons properly) CONFIRMED: I spoke to No-Bark before picking this quest up from Dusty McBride. The Nightkin would stand by the corral and not attack. If he was cloaked and I killed him, his body would remain cloaked. Once, he was lacking his cloak entirely and when I attacked and killed him there was nothing to loot on his body. When I exited the game and restarted it, and waited by the corral for him to arrive, he functioned properly and opened fire on the brahmin, losing his cloak in the process. I was then able to kill him, loot his body, and complete the quest.


 * The Nightkin in question may revive at a later date, uncloaked and non-hostile with all of his original inventory in tact. This is useful for grabbing a minigun for sale or repair as it seems unable to equip any of its items and it is an easy battle.

Note
you have started the quest Come Fly With Me and have not talked to him.
 * This quest ,even though you are killing a nightkin, will not have any effect on Davison if