Combat in Dragon Quest IX is turn-based, with enemies visible on the field. Touching an enemy initiates a battle. The order of turns is determined by character and monster agility. During your turn, you can choose from several actions: Attack, Spell, Ability, Item, Defend, or Flee. Understanding enemy weaknesses and resistances is key to efficient combat. For example, some monsters are vulnerable to fire spells, while others might be resistant to physical attacks.
The 'Tactics' menu is crucial for managing your AI-controlled party members. You can set their behavior to options like 'Show No Mercy' (attack aggressively), 'Fight Wisely' (balance offense and defense), 'Focus on Healing' (prioritize healing), or 'Don't Use MP' (conserve magic points). Experiment with these tactics to find what works best for different situations and party compositions. Don't be afraid to manually control your party members for boss battles or particularly challenging encounters to ensure optimal strategy. Remember to keep your HP and MP topped up, especially before entering new areas or challenging powerful foes.