Meet Secundus. A Changeling soldier.
Queen Chrysalis herself asks and orders the soldier to assist her in the attack of Canterlot, his ability being very special and unique.

He was the savior of the whole Swarm.

However, Secundus's mindset is very different. His morals are having a conflict in his mind. It was for the good of his people and the suffering of ponies, and vice versa. Making his decision of refusing to assist Queen Chrysalis in the attack Canterlot, it had changed his life.

He was exiled from the Swarm forever due to his disloyalty.

Trying to go day by day of surviving alone, little did he know that something would come crashing into his life, changing it again forever.

Literally.

Huge thanks to MLPfield 3 for editing!
Chapter 1
Chapter 2 edited