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A hero is generally someone who possesses immense courage and martial strength.
Or it refers to someone with heroic qualities.
Alternatively, it refers to a selfless and fearless individual who fights valiantly for the people's interests, earning widespread admiration for their character.
In the Divine Realm, heroes are usually beings with immense courage and martial strength, and with unwavering convictions, good or bad morals notwithstanding.
Of course, having courage and martial strength alone does not make one a hero; these are merely preconditions. Whether one can become a hero is largely a matter of luck.
Aside from heroes like Lin Xiao, who are created with special treasures, normal heroes usually reach their species' limit and then, due to certain circumstances, break through it. There is an extremely small chance they might become a hero, but there is a greater likelihood they will not, only advancing a level beyond their racial limit.