Sentinel Lyons

Sentinel Sarah Lyons is a Capital Wasteland Brotherhood of Steel member and the commander of the Lyons' Pride in 2277.

Background
Sarah Lyons was born in 2247 in the Brotherhood of Steel's Lost Hills bunker in California.

Some time after the Chosen One stopped the Enclave on the West Coast, the Brotherhood of Steel ruling council decided to send a contingent of soldiers to the East Coast with a mandate to recover any and all advanced technology from Washington D.C. and to investigate the reports of super mutant activity in the area.

And so a small but hardened contingent of Brotherhood of Steel soldiers, led by an idealistic Paladin named Owyn Lyons (and accompanied by his eight-month-old daughter Sarah, as well as his friend and technological adviser Scribe Reginald Rothchild) set out from the Lost Hills Bunker in California. This started the long trek east to what was once Washington D.C.

A permanent base known as the Citadel was built into and beneath the ruins of the Pentagon. Owyn Lyons (now Elder of the Capital Wasteland division of the Brotherhood) and his soldiers also found the super mutants in the urban ruins of downtown D.C. and helped stop the mutant tide from overtaking the entire region by at least keeping them at bay.

In 2277, Elder Lyons' daughter Sarah is now a grown woman, but she is still one of the Brotherhood’s finest warriors, if not the fiercest. In fact, she’s the only member to have achieved the illustrious rank of Sentinel, and now commands her own elite squad, Lyons' Pride.

Relationships
She is the daughter of Elder Owyn Lyons. She also has taught Squire Maxson to shoot, and kill a man by stabbing him in his kidneys, as read on his terminal. Squire Maxson apparently developed a crush on her afterwards.

Daily schedule
During Following in His Footsteps, she can be found at the Galaxy News Radio building. After The Waters of Life she can be found inside the Citadel (up until Take it Back!). After the reactivation of the purifier and during much of Broken Steel, she's comatose in the Citadel infirmary if she survived the purifier attack. After the completion of Broken Steel, she can be found patrolling the Citadel (again, if she survived).

Quests

 * Following in His Footsteps: The Lone Wanderer first encounters Sarah when pursuing their father for the main quest, Following in His Footsteps. After the long trek through the DC tunnels to make it to the Galaxy News Radio station in order to question Three Dog, Sarah and her squad happen to be in a firefight. This occurs just as the PC emerges from the appropriate subway. After a short, furious battle, Sarah questions the PC of their motives, and, after hearing them out, warns to be more careful, as the super mutant activity is strong in that particular area. She then offers to take the PC along to the GNR studios since they were making their way there. Upon reaching GNR studios, the PC is forced to aid Lyons and her squad against a super mutant behemoth.
 * Take It Back!: Sarah, after inducting the Wanderer into the Pride, briefs you all on the mission to come. She personally accompanies the Wanderer into the Jefferson Memorial Rotunda for the final confrontation with the Enclave's second in command Colonel Autumn and his handful of personal guards. Based on the Wanderer's choice, Sarah Lyons will:
 * Watch the Wanderer's selfless act of sacrifice in choosing to enter the chamber and mourn his/her inevitable demise (unless Broken Steel is installed).
 * Enter the chamber herself, sacrificing herself in place of the Wanderer.
 * Wait until the Purifier explodes.
 * Who Dares Wins (Broken Steel): After the player escapes from the mobile base, Sarah Lyons will appear again (unless she was killed) and pick you up in a Vertibird, taking you back to the Citadel.

Effects of player actions

 * She will comment if the player is wearing Power Armor when fighting the Behemoth in the GNR plaza, saying he/she can wear it for helping them defeat it.
 * (Broken Steel) If you betray the Brotherhood and launch an orbital strike on the Citadel, she and the other Brotherhood members who picked you up will attack you in a fury, calling you a traitor. It is then possible to kill her, as she will no longer be an essential NPC. This is also the case with Scribe Bigsley.
 * (Broken Steel) If the player activates the purifier himself/herself, or uses Fawkes, Sergeant RL-3 or Charon to start it; it is revealed that an energy spike knocked both of you out. Two weeks later after you wake up, she's still in a coma, "unresponsive but stable".
 * (Broken Steel) If Lyons activates the purifier, she was killed by the radiation and doesn't appear.
 * (Broken Steel) After completing all the main quests, she will comment that she wishes she could get to know the Lone Wanderer better.

Appearances
appears only in Fallout 3.

Behind the scenes

 * Fallout 3 Faction Profile – the Brotherhood of Steel by Emil Pagliarulo.

Bugs

 * At the end of the game Sarah Lyons can glitch into either saying that the control room still isn't clear or repeat the phrase "Steel be with you!"
 * After Waters of Life, before talking to Rothchild for the quest Finding the Garden of Eden, Lyons appeared on the road leading from Arlington Library to the Flooded Metro, walked along the road to a point past the Nuka-Cola Plant. Not sure if this will affect Take it Back!, had not spoken to her after entering the Citadel.
 * At the beginning of Take it Back!, as Liberty Prime crosses the first bridge, she may jump into the water and stay down there indefinitely.
 * At any point in the game, Lyons may talk about the Enclave fortifying the water purifier, and about the Enclave having Vertibirds. This happens only in NPC to NPC conversations though.
 * If you begin the Take it Back! mission, then fast travel to Falls Church, Sarah Lyons may appear as a follower in the area.
 * After you destroy the Enclave at the end of Broken Steel, the first thing she will say to you afterwards is, "Remember when I first met you at Chevy Chase?", even if the Lone Wanderer never completed the Galaxy News Radio quest.

Sarah Lyons Сара Лайонс