Leon Ylok’tiv

Leon Ylok'tv also known by a speech called "Bravery of the Great Progressive Soldier"

It is unknown why he is known as the Great Progressive Soldier.

His death may have been caused by John Sectun.

In Endless Stories Chapter 1 on Chapter 5, it is revealed that he was the only one who could've prevented the war.

But because he died, the Civil war commenced thanks to John Sectun