"Defiance Has Fallen" is a pivotal quest in Fallout 76, marking the introduction of the Brotherhood of Steel faction to the game's storyline. This quest sets the stage for a series of missions that delve into the history and fate of the Brotherhood in Appalachia. Here's a comprehensive guide on how to complete this quest and what you can expect along the way.
Introduction to the Quest
Defiance Has Fallen begins after completing the quest "Coming to Fruition." To initiate the quest, head to Abbie's Bunker, located in the North-East corner of the Mire region. Inside the bunker, access Abbie's Terminal and read the entry titled [Fort Defiance]. This will start your journey to uncover what happened to the Brotherhood of Steel in Appalachia.
Objectives of the Quest
Find the Location of Fort Defiance: Your first objective is to locate Fort Defiance, the former base of operations for the Brotherhood of Steel.
Discover the Brotherhood's Fate: Uncover the events that led to the downfall of the Brotherhood in Appalachia.
Power Up the Asylum: Restore power to the old asylum where Fort Defiance is located.
Completing "Defiance Has Fallen" and delving into the storyline of the Brotherhood of Steel in Fallout 76 offers players a rich narrative experience, alongside valuable rewards that can enhance their gameplay. Gaining access to new gear and resources, including caps, will be essential as you progress through the quests and engage with the faction's mission to reclaim their place in Appalachia. The quest's culmination sets the stage for further adventures, allowing players to gather resources like Fallout 76 caps that are crucial for purchasing important items and expanding their equipment to tackle more challenging missions ahead.

Walkthrough
Step 1: Camp Venture
Travel to Camp Venture: This is your first stop in finding Fort Defiance. Camp Venture is located south of Harpers Ferry, near the border with the Cranberry Bog.
Clear the Camp: Be prepared to face a horde of high-level Scorched enemies, including Believers, Zealots, and Wanderers. Use the rock ledge overlooking the camp for a tactical advantage.
Access the Command Center: Hack the terminal by the door to unlock it. You may need to find a password by exploring other buildings in the camp.
Find the Letter to Tommy: Inside the Command Center, locate a letter titled "Letter to Tommy," which reveals the location of Fort Defiance.
Step 2: Fort Defiance
Travel to Fort Defiance: Located in the Allegheny Asylum, south on the edge of the Savage Divide and Cranberry Bog regions.
Enter the Asylum: Be cautious of ghouls and other enemies inside.
Restore Power: Find the circuit breaker on the top floor to restore power to the asylum. This will allow you to access previously locked areas.
Complete the Quest: Read the note titled "Final Stand" on the bulletin board to complete the quest.
Rewards
Upon completing "Defiance Has Fallen," you will receive several rewards, including:
Photo Frame: The Brotherhood!
Brotherhood Fatigues
Short Gatling Gun
5mm Rounds
Plan: Protective Lining BoS Underarmor
Radaway.
Next Steps
After completing "Defiance Has Fallen," you will begin the next phase of the Brotherhood of Steel quest line. To proceed, you need to complete the "Back to Basic" side mission at Camp McClintock. Once that is done, you can move on to the "Recruitment Blues" quest, which is part of the main storyline involving the Brotherhood.
"Defiance Has Fallen" is not only a quest but a gateway to understanding the history and struggles of the Brotherhood of Steel in Appalachia. It sets the stage for a deeper exploration of this iconic faction and their role in the Fallout universe.