Dishonored, the last Assassin.

Once a long time ago, Before Celestia and Luna's birth In the days when equestia had humans, Even a alliance between Equine and Human. There was unrest, The force's of evil had gathered and only a handful of ponies and a hoof full of humans knew of this. Two humans were corrupted by a vicious sludge that was constructed from pure evil. The days were dark and horrible for the human's of Equestia, and they were so dishonored, They committed a mass exodus from Equestia and never returned. The reason was...

...And so shortly after humans and even their inventions were soon forgotten. All but one human had left equestria, a single male set in stone for his crimes and good deeds alike. This human was  warrior. A shining  example of what every mother dreads. This human was a assassin and his crimes were harming and killing a innocent. And his good deeds were same, though you could argue that he showed mercy, others would argue that his mercy was not needed or asked for.

He was one with his blade, one with the shadows, and one with his creed. His own King rejected his tactics as inhumane, and cruelly this human was set in stone by a powerful spell and guarded by a demora who would try to kill him when he was released, but he can only be released him when ordered by rightful authority, singing the Song Of The Shadows.

After the criminal was imprisoned, the human's lost their honor, lost their capital, and without even a forwarding address for any who searched for them, left with the intention to find a new land far from all sentient life so this dishonorable incident never happens again. The statue prisoner and his immortal warden were left in the deepest mine the human's ever built and was soon forgotten, all that stood above ground was leveled by time and erosion.

Exempt from The Last Human, The Search, By Starswirl the Bearded.