The Screams of Brahmin (quest)

The Screams of Brahmin is an unmarked quest in Fallout: New Vegas.

Description
Something or someone has been killing brahmin at night in Novac. Stake out the pens at night and find out who's to blame.

Walkthrough
When speaking to No-Bark Noonan in Novac, he will tell the player that an invisible "chupacabra" has been killing Dusty McBrides brahmin and indicates that the player should speak to him. Dusty informs the player that they should wait near his brahmin pen at midnight. You will see the attacker is a crazed nightkin. The nightkin carries a minigun and a holotape entitled The Screams of Brahmin. Upon completion of the quest, Dusty will give the courier access to his freezer, which contains 10 brahmin steaks. Additionally the courier will gain Novac fame, sufficient for Accepted status without any prior contact, and positive Karma.

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 NPCs will completely ignore him, even if you push him into the center of town.
 * On a similar note, the nightkin in question may revive at a later date where you killed him. It shall be uncloaked and non-hostile with all of his original inventory intact. This is useful for grabbing a minigun for sale or repair. It seems unable to equip any of its items and is thus an easy battle.
 * Layabout_nightkin.jpg Sometimes the nightkin will respawn (or be replaced by another) and then proceed into Novac until it is waiting at the corner of the motel. It is not hostile but remains cloaked. If you speak to it, it may reply "One head gone, many heads to follow!" but do nothing else.
 * Sometimes the nightkin will go from his rock to the ranch as usual but will not attack the brahmin and only stand there cloaked (as if he forgot how to equip his minigun, and the script forbids him going closer to brahmin so he could melee the bovine). This happens when the nightkin was attacked by a nearby glowing one. In this case, killing him before he touches a brahmin will not solve the mini-quest. You have two possible solutions here: 1) If you've got the savegame before the nightkin was attacked by glowing one, fully close your game (simple reload will not help, the nightkin will still be bugged), then load, go kill the troublesome glowing one (sometimes it is somehow invisible but your companions are still able to attack it), proceed with your quest as usual; 2) Kill the bugged nightkin and proceed with your game, coming back to Novac from time to time - after a while the nightkin will respawn at his usual place and then you can try the quest again. *Addendum: It seems two conditions have to be met to keep this bug from occurring: 1) You must be within the fenced area, & 2) you must be crouched with the attempt at sneaking (even if your detected). When he goes to fire, stand up and attack. This will keep the bug from occurring & complete the quest.


 * 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 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.


 * If you kill the nightkin before he uncloaks himself and kills a brahmin, the quest may not be completable even if you retrieve and read the note. When returning to McBride, there will be no dialogue option that states the threat is gone.


 * 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)


 * The nightkin doesn't attack the brahmin and just stands the other side of the fence, watching. When you approach the nightkin, he does nothing. You may stand as close as you want and no reaction will come from him. If you shoot him while he's still cloaked, you will be able to kill him (his dead body falls still cloaked), search him and gain XP from it but when you go back to Dusty McBride you only have the option to tell him that you haven't found anything.
 * Possible Bug "Fix": With the bug, normally when you attack the bugged, herd attacking nightkin, his/its Stealth Boy never malfunctions allowing you to see it. Also, when it dies, it stays invisible. This is a sign that the bug is preventing completion of this task. But letting a companion (Craig Boone was used in this case) attack/kill the nightkin will make its Stealth Boy fritz like a normal nightkin and when it dies it will become visible. You will have to initiate the attack for your companion and the nightkin to become aggressive toward one another. Loot the nightkin corpse and talk to Dusty McBride to receive 75xp and all the steaks you want from his freezer.
 * Possible Bug "Fix" 2: Try turning the ps3 fully off, flip the switch in the back to totally turn it off, and back on so it clears the cache and resets the event. Wait till that time for him to show up and get near him to start it off. Sometimes works.
 * Possible Bug Fix: Turn the console off and remove the power cable. When you load the game the cache should be cleared.  Go to the corral to wait.  The nightkin will show up around 00:20.  Avoid the temptation to look at or watch the nightkin as this can lead to him getting stuck on the pole by the train tracks.  Face the opening in the fence instead and wait to hear his stealth sound effect and the shots of his minigun hitting the brahmin.  Once the brahmin is dead you can proceed normally.


 * A similar bug. However, the nightkin appears already at daytime and remains there uncloaked. After you kill him, you're able to tell Dusty McBride that no one will kill his brahmins. You finish the quest and gain fame with Novac.


 * You are able to use the wait function to make it day time and he will still remain there. If you look at him, the word nightkin will show with no health as if he is a friend (in the same colour as your HUD, rather than in red). You may also crouch and pickpocket him (despite not being given the option, you just crouch and press A) and he will Yell at you, but stay still, and you'll lose karma!


 * The nightkin will respawn after the mission is completed after some time. At high levels it will be a nightkin master. The nightkin will respawn uncloaked, possibly related to finishing Guess Who I Saw Today.


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

-go to the rock in novac where said nightkin is meant to spawn -Open console, type in "player.placeatme 000b9a38" without the " of course. -[censored] said nightkin in face with large pointy instrument of death -loot -happy dance.
 * Sometimes the nightkin wont be present at all, simply do the following