A/N: This story idea was created by @lylly_pink_ranger . I may further develop this into a book in the future, but we'll see. If I develop this into a book, I'll probably fix all of the plot holes currently in this prologue thing, but for now, here is the draft that I wrote a while ago.

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"Cecilia! Look out!" She whirled around after plunging her seraph blade into the demon before her, but it was too late. Something struck her face, and she fell into darkness, her face burning.

Slowly, she became aware of her surroundings. She could feel, cocooning her, the familiar linens of the Institute's infirmary, from being here countless times before. Opening her eyes, she gave a little gasp. There was nothing but darkness. She blinked, but nothing changed.

Cecilia could hear someone approaching, the sound of their footsteps bouncing off the stone walls. "How is she?" It was her mother.

"I can't see!" She cried out in panic, reaching out for her mother, but only grasping air. Her mother slipped her hands into Cecilia's, and squeezed gently, reassuring her.

I have done as much as I can, though I am afraid she will never be able to use her eyes again. It was already infected when I arrived, and I did as much as I could, but it will leave a scar, unfortunately. I am sorry, Evangeline, Cecelia. 

Cecilia froze. Blind? Permanently? How will I be a Shadowhunter now?

She can still be a Shadowhunter, but you will need to alter her training. I can send for an experienced teacher to train her.

Cecilia opened her mouth to thank the Silent Brother, for it was only polite, but then closed it again, feeling as though she was facing the wrong direction. She turned her head on the pillow and closed her unseeing eyes, a mixture of desperation, sadness, fear, apprehension, and some other unnamable emotions overwhelming her.

"That would be wonderful. Thank you, Brother Zachariah." Her mother said in a hushed voice, in Cecilia's stead.