Heroes, with a capital H, is the term for those individuals born with great gifts of strength, faith and magic. Their martial power means they tend to have large roles in world events, their strength turning the tides of battles, their charisma swaying the minds of men.
Before the War of Heroes, Heroes were fairly common, often taking mercenary work or bowing to kings, demons and gods. Most Heroes, at the peak of their power, flock to Circadia where their skills are appreciated and utilized. The strongest of Heroes, those who find no challenge in the struggles of men, travel to the outer realms where they’re put to use by immortals with need for powerful soldiers.
After the war, Heroes no longer existed. Some people were still capable of minor bits of magic or divine power, but nothing compared to the feats of old. On the rare occasion a hero is born, their fate is intertwined with that of the world, and they have a huge impact on the events to come. The last known Heroes died in the final days of the Dark War, save for The Devourer.