Keikokumars

Arial is a soldier in the Human resistance against the Demonkind. 

After the destruction of the resistance he was given a chance to undo the past mistake.

Join as Arial went back in time and prepare to save his family and the world of humans against the Demons.
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Other synopsis

Tales of great heroes that fight dragons and demons, stories of evil monster and cruel men and cunning woman, of great heroes fighting great wars, the stories of their noble life and tragic death stretched across the stars, a thousand, and a thousand more, and a thousand more, glimmers of their battles, of hope and love and their struggles
How much stories, how many battles were fought, won or lost ?
They call it the Age of Heroes

Age of Heroes ( Age of Heroes Chronicles)

As for the reason why Leander is so loyal to the Emperor, it is because the Emperor aspiration is something that Leander agree with

Silas might balk at the idea of unification of the Human Continent using such a forceful way, but Leander clearly did not feel as such.

He is unlike his father and believe truly in the world that the Emperor wanted to create.

Because of loyalty and the trust that the Emperor have for him, he become even more famous.

In war, he did not go overboard and in his conduct, he never went too far but he stands his ground

Educated in the studies of art of war and learning from his father since he is of a young age about the art of politics, made him men of sword and pen.

While his characters in the thought of the people is that he likes to boast and his title itself is quite ridiculous as people called him Wang Mu the Smasher, to many people of the lower class, they idolize him

Santiago Capulet IV