Cult of Diablos

Sid made up a story about the 3 heroes, after slaying Diabolos, were cursed by the Demon and all their descendants became victims suffering Mana Deviation. The porters of this disease were respected by the people because it meant that they were the heroes descendants. Later on the Order of Diabolos manipulated the truth and they became hated by the folks and rejected with the name of cursed child etc...

In fact, everything the Sid is true but he don't know that.

All of the heroes who fought Diabolos were female. That’s why the Curse of Diabolos only manifests in females.

Diabolos Children.

The Order of Diabolos combs through orphans and children of poor families, and kidnaps any one of them that displays even the slightest affinity for magic, then raises them in specialized facilities. Due to the repeated application of severe training menus, brainwashing programs, and drug administration in those facilities, those who successfully graduate are less than 1% of the number that go in. Children 3rd is considered the failures of the graduates, pawns to be used and thrown away. Because their minds are already broken, they can’t leak any information, but their fighting prowess greatly overshadows any average knight.

2nd are those whose minds are stable. The very few 1st are those who possess very significant power by world standards.

Named Children.

Those among the Diabolos Children who have provided exceptional contribution to the Order are granted a name. Most Named are 1st, but named 2nds are not entirely unheard of either.

Furthermore, there are Named who have climbed into the ranks of the Knights of Rounds. More like, within the organization, being Named is almost considered a requirement to be considered for a position in the Rounds.