Higher Level Battles
The higher the level of the target, the tougher the enemy will become. The enemy monster's level and skills will scale with the land's level. Some land will also have multi-wave battles where armies are forced to fight back-to-back on the same tile.
Far Away Land Battles
The farther away the target from its attack origin, the larger the army will become. This means that the level and skills of the enemy will not change, but the army size will scale relative to the distance. Attempting to attack land that is significantly far away from your main castle could lead to an overwhelming defeat.