Gravedigger

The shouts of people echo through the plaza as they smash the white crystal statue and view the scholar who found the cure to the plague as a traitor. They charge into the libraries, burning all records of the past, and erasing the achievements of heroes from history. You know how to guide an annihilation. Once people have completely forgotten all of their past civilization and spat on the foundations of themselves, the withered society that remains will naturally welcome THEIR descent without needing on The Blemished One's troops.

You dig up their graves and ridicule the foul-smelling history books. They could never compare to the fashionable charm of a spaceship or the endless fun that the Interastral Network has to offer. So, they set forth digging up their own tombs. No longer do they have a place to bury themselves when dead. Today, they forget yesterday. Tomorrow, they shall murder who they are today.

Such a beautiful scene, strangling the life from an entire civilization with your own two hands.