At certain points in the game, armies clash and a strategic battle system is used, similar to those seen in military turn-based strategy games. These are set on a graph, a set of connected vertices. Certain places on the map offer special advantages for units occupying them, such as a defense bonus for a forest or castle ramparts, or automatic free healing for a base of operations. When attacking, units in other nodes adjoining the attacked space can aid, giving a bonus to the attack. When army units engage in combat (generally by one unit moving into a space occupied by a hostile unit), the standard "Suikoden III" battle system is used, albeit an extremely sped-up variety in which no orders are issued and characters act on a simple AI. Leaders can aid their army units with a variety of special abilities and rune magic. Each side also requires a strategist; the better the strategist, the more moves that side can take before their turn is over. Strategy battles end when the pre-set mission objectives are completed, generally either to take a node on the map for offensive missions, or to successfully hold a node or escape for defensive engagements. Alternatively, they can end in failure if a main character is defeated.