Sentinel Lyons

Sarah Lyons is a Brotherhood of Steel sentinel and the commander of the Lyons' Pride squad

Background
Sarah Lyons was born in the West Coast Brotherhood of Steel headquarters. Her mother died several years before she accompanied her father, Elder Owyn Lyons, on his journey east to the Capital Wasteland.

In the ruins of Washington, D.C., she commands the Lyons' Pride, which she describes as "the best of the Brotherhood, bar none." Lyons decides who is allowed to be a part of the squad. Lyons is a role model for Arthur Maxson, a child living at the Citadel. He mentions that the sentinel is kind and has taught him a great deal, including taking him out once to kill super mutants. He admits that he accidentally shot her, but that her injuries were not serious. In a terminal entry, Maxson wrote that Sarah taught him how to kill a man by stabbing him in the kidneys, and that he thinks he is in love.

She became elder upon the death of her father but subsequently died in action. The Brotherhood of Steel struggled to find an effective leader for several years until Arthur Maxson became elder.

Appearances
Sarah Lyons appears in Fallout 3 and its add-on Broken Steel, as well as a legendary dweller in Fallout Shelter. She is also mentioned in Fallout 4.

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 The Waters of Life, before speaking to Rothchild to start the quest Finding the Garden of Eden, she will appear on the road leading from Arlington Library to the Flooded Metro, walking along the road to a point past the Nuka-Cola plant.