Edgedancer

"Edgedancer" by Brandon Sanderson is a short but powerful novel from the Stormlight Archive series that follows the story of Lift, a teenage Knight Radiant who discovers that time doesn't stand still for anyone. After being granted eternal youth by a goddess, Lift struggles with suffocating court life and heads to Yeddaw to protect the downtrodden from Darkness, a dangerous executioner hunting people like her with budding powers. Lift knows the responsibility falls on her to protect those in need and rises to the challenge with fierce determination.