I think it's only useful when the opponent doesn't have archers and can't use magic - although even in this rare case, the effect of the Knight's super ability is hardly comparable to the effects of super abilities of other factions - so it's unlikely that it can be considered a game-changer...
Skill tree 3.0 comes with "Tribes of the East." You can also download it on our (I think) and other websites.
Цикл "Закадычные враги": "Особенное гостеприимство, "Супероружие", "Меж молотом и наковальней"
"Падение Шантири"
Кампания для "Кодекса Войны"
"Выбор Сагиттеля"