A unicorn is found guilty of the crime of High Treason, under dubious circumstances, he is sent to be executed by firing squad, his request. His crimes were viewed as against harmony, unity, and above all, the interest of nations.

He will not bear witness to the dawn of a new horizon, but he'll witness something else; the setting of a new flame for something new. He believed he was the spark for that new flame, and when the harshest lights cast down the darkest shadows, so too do those shadows conceal many things in their darkness.

[The entire story happens after "The Final Problem."]

The cover art is by the same friend (who remains anonymous)

Speaking of which...
I'm sorry for the first couple of chapters being first-person... but the later chapters switch to a third-person pov, so there's that.