In the past, Nergal Kingdom couldn't have any major advantage in fighting against the Heart kingdom because of two fearsome figures. First is King Leon and second is Duchess Amberblaze.
Whenever one of these two power figures appears on the Windshire Fort, the Nergal kingdom will need a large army like now to fight against the Heart kingdom. The seventh-grade combatant King Leon himself is capable of destroying their whole army with his superior strength.
Hence, the Nergal kingdom often uses a teamwork strategy to contain King Leon whenever King Andvari is unavailable to join the battle. Most of the big and strong factions in the world also use this kind of tactic to hold seventh-grade combatants.
Some experts even manage to create a baseline that it needs at least four sixth-grade combatants with good teamwork to hold one seventh-grade combatant. Anything below that, be it in number or the combatant grade, will be useless.
