Midnight Ranch Attacks

 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 about Brahmin who 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 Steak's 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.

Bugs
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 is killing the Brahmin, the quest will be un-completable.