Kallos Rivehan.
He was not a being who lived an easy life.
Born a member of the Behemoth Race, he was left abandoned to fend for himself and learn his path to strength.
The path he took was filled with cruelty and blood, yet the man himself retained his righteous heart.
Though, it was not by his own efforts alone.
When Atlas first met Kallos, the Behemoth was rampaging in the south of the Desolate Dragon Continent, completely rid of his sense of reason. It was only after being severely wounded in battle against the Heavenly Emperor that he came back to reality.
That was also the start of their friendship.
Atlas was still growing at that time and had many of the same issues as Kallos. The two were able to bond rapidly and become the brothers closer than those related by blood.
With a support system behind him, Kallos was able to separate himself from the belligerent nature of his race and strive for something more.