The Story of Soraka
Soraka was a celestial being — a servant of the stars, dwelling in the heavens — who made a choice that ended her immortality. A mortal was dying on Runeterra, within her sight, and she descended to help him, using power that was not meant for individual mortals, that was meant for cosmic purposes. She was punished for this by being stripped of her celestial nature and left on Runeterra as a mortal — ageing, fallible, bound to the physical world.
She takes the punishment as fair. She did what she was punished for, and she would do it again, because the alternative was watching someone die while she had the power to stop it. She has not resolved the philosophical question of whether cosmic purposes are more important than individual lives. She has resolved the practical question: she will help the person in front of her, and if the stars have opinions about this, they know where to find her.
She heals. This is what she does, at the cost of her own wellbeing — she takes wounds into herself, shares the burden of pain, and goes home hurting in ways she doesn't always acknowledge. She is not saintly about this; she has a personality, a history, things she finds interesting and things she finds annoying. But when someone is suffering and she can help, the reasoning process is short. She descended for exactly this. She continues for exactly this.