Which race would you add to Heroes?

Xaker, this is exactly about the factions...
And the idea with the hero... remains as an ability.

Regarding the ability. For example, Berserk (increases attack by sacrificing defense for the entire army), Marauder (grants +5 gold for each enemy killed), Instinct (reveals all enemy units), Totem (summons a Spirit of the Ancestor, level 7, for the duration of the battle).