Sierra Petrovita

Sierra Petrovita is a Nuka-Cola addict living in Girdershade in 2277. Ten years later, she can be found at the Nuka-World amusement park, on her ultimate Nuka quest.

Background
Sierra is completely obsessed with Nuka-Cola and everything related to it. Her addiction to the soft drink started at or before the age of sixteen; since then, she has spent every bottle cap left by her parents in the pursuit of acquiring Nuka-Cola bottles, as well as assorted merchandise from vendors, travelers, and towns throughout the wasteland. She is largely incapable of holding a conversation without trying to steer the subject towards the soft drink.

Ronald Laren is Sierra's only neighbor in Girdershade in 2277. Unfortunately for Ronald, who is attracted to Sierra's good looks, men are the last thing on Sierra's mind, unless they are bringing gifts in the form of Quantum Nuka-Colas. Ronald helped her acquire some Nuka-Cola artifacts for her hoard, and has even joined Petrovita's Nuka-Cola Fan Club as its first and only member. Sierra, styling herself as the President, Recording Secretary and Treasurer of her fan club, was delighted to have someone to share her obsession with, unaware of Laren's feelings for her. To Sierra, Ronald is simply a friend who keeps her safe from raiders.

Sierra managed to survive the treacherous Capital Wasteland and even expand her Nuka-Cola museum. By 2287, her obsession led her to the derelict Nuka-World, tracking down more artifacts for her collection. The ultimate goal is to win an ancient, forgotten contest, with the objective of finding ten hidden Cappys in the park, and a reward of meeting Bradberton in person. Although it assumed that he is long dead, what matters to Sierra is obtaining the original Nuka-Cola formula, thought to be located in Bradberton's office. The raiders who control the park tolerate Sierra's presence as long as she keeps to the market.

Daily schedule
In Fallout 3, Sierra stays in her house all day drinking Nuka-Cola and doing other miscellaneous things. In addition, she hounds passing travelers for any trace of Nuka-Cola Quantum.

In the Fallout 4 add-on Nuka-World, she can be found near Bradberton's office in Nuka-Town USA.

Quests

 * The Nuka-Cola Challenge: Sierra has her own Nuka-Cola "museum" (a display of her collection within her shack) which she gives tours in. After completing the tour she will give the Lone Wanderer an ice cold Nuka-Cola and asks them to gather 30 Nuka-Cola Quantums for 40 bottle caps per bottle which adds up to 1200 caps. Completing the quest her way grants good Karma.
 * Mississippi Quantum Pie: After completing "The Nuka-Cola Challenge," she can make the Lone Wanderer a Mississippi Quantum pie out of 1 Nuka-Cola Quantum, 1 bag of flour and 1 bottle of vodka.

Quests

 * Cappy in a Haystack: Sierra asks the Sole Survivor to find 10 hidden Cappy images in the park.

Appearances
Sierra Petrovita appears in Fallout 3, the Fallout 4 add-on Nuka-World, and Fallout Shelter.

Bugs

 * If you kill Sierra and then steal items from her house, she may protest, even though she is dead.
 * If you fight any creatures outside of Sierra's house and then enter Sierra's house, you will not be able to communicate with her because she is fleeing. If you enter her house while enemies are still nearby, she will flee the house and disappear forever. Sometimes, she may run for cover at another house in Girdershade and can be found there, rather than fleeing town.
 * If you plant an explosive on Sierra and then ask her to make a Mississippi Quantum pie, she will start making it, but explode during the process. The player is stuck waiting for it to be made. Loading a previous save fixes this problem.