Dusk

A large, dark cloaked figure galloped through the darkness, creating sound whenever she hit the ground. To think, after all those years of lessons, she had learned everything. This was her test.

She zipped along the streets with a buildings up against each other on the sides. All lights were off, and there was nopony out tonight.

She skidded to halt when she reached the end of the street. With the swift motion of a lavender hoof, the figure removed the hood of her cloak. She was a lavender unicorn with a long, unwell-kept, navy, purple, and pink mane. Her long horn protruded from her forlorn between her mane. Her right (your left) eye were a fierce and hurt purple with a touch of despair. Her squared muzzle had a pink scar right across her mouth. Another scar ran over her left eye (your right) where a sickly green energy wafted out of the scar on the eye, but not her skin.

She ripped off her cloak revealing large, lavender wings folded on her sides. Her tail was in the same condition as her mane. A large scar ran across her right wing, while showing tattered feathers as well.

Twilight Sparkle the Princess and Alicorn of Friendship and Magic.

She was currently performing her final test for her mentor. The task her mentor had given her was to kill a specific pony...

And Twilight Sparkle was eager to perform the deed.

How did she become like this: a murderer?