Kills nightseer with Luna's horn

This… this is going to be the Luna Academy for Young Unicorns? A magical school of my very own? Just like yours?
The ribs, the wings, the skull with its slender horn… I knew they were all from the same pony.

The blade straightened out and shot straight at me, aiming between my eyes. At the last moment I magically tossed the Book in front of my face. Red mist poured about its edges, the sword dissolving as it struck the black leather cover.

“I believe I’ll be taking that.” Nightseer focused, wrapping her magic around the Book. Her shield faltered for a moment as she felt the cold shock of the book’s aura. But only for an eye-blink, not long enough for me to take advantage.

“You dare!” I was trembling even harder now. But not from weakness or horror. The alicorn took the Black Book, easily prying it from the grip of my telekinesis. But I didn’t care. The Black Book was nothing to me. Not compared to what Nightseer wore around her neck like trophy.

“And you die,” she said casually, almost yawning as she took the Book for herself. Motes of magic formed about her, fashioning themselves into eldritch knives.

My legs gave out. I dropped to my knees; they splashed into a thin pool of my own blood that was becoming saturated with pink. My lungs were burning. My head throbbing harder.

I didn’t care. (Be Unwavering!) I focused on that skull with its long, slender horn.

The host of magical knives darted through the air at their target.

Nightseer glanced downward as she felt her necklace shift. With a telekinetic thrust, I drove Luna’s horn through the soft tissue under Nightseer’s muzzle and up into her brain.

She twitched once, the spark of life remaining in her just long enough for her eldritch knives to strike home. Most evaporated against my new barding, but several sunk in deep before vanishing along with Nightseer’s shield spell as the alicorn crumpled to the ground.