Fiends

The Fiends are a raider gang made up entirely of chem fiends, hence their name, in the Mojave Wasteland and New Vegas area.

Background
Motor-Runner and the Fiends took advantage of those who lived in Vault 3, gaining access to the facility and killing the inhabitants. Since then, the Fiends have grown stronger, and they now claim a large part of the southwestern New Vegas conurbation as their territory. The NCR seek to get rid of the group, but are restricted to holding their line and not moving against them.

Violet, Cook-Cook, Driver Nephi, and Motor-Runner lead the group. The Fiends attack anyone aside from the Great Khans, who supply them with chems. Cook-Cook bought slaves from Saint James and Dermot. Caesar considers their dependence on drugs to be unimpressive, killing them if given the chance. The Fiends won't attack caravans marked by the Legion.

The NCR seeks assistance in killing Fields near their headquarters at Camp McCarran and has put bounties on their leaders' heads. Fiends kidnap locals from around New Vegas, and the Omertas mention that the NCR should "do their fucking job" and kill the Fiends as they are "bad for business," stealing a recent shipment of weapons. as their secret gun shipments are occasionally compromised by Fiend activity.

With a Speech check of 65, one can convince the main guard of Vault 3 that they are a Great Khan selling chems, which can be sold for 20 caps each or 22 caps with a Barter of 65.

Appearances
Fiends appear in Fallout: New Vegas and the graphic novel All Roads.

Bugs

 * Upon dealing with Motor-Runner and the Fiends in a friendly way during Aba Daba Honeymoon or by passing a Speech Check at the entrance to Vault 3 the Fiends might become permanently friendly. Entering in the console will make them hostile again.
 * Upon killing Cook-Cook, Violet and Driver Nephi (leaving Motor-Runner alive), and complete the endgame quest Eureka! for the NCR, one can still get the ending as if all Fiend leaders remain alive.
 * Completing the endgame quest No Gods, No Masters instead will result in no Fiend ending at all.