The heart of Monster Hunter Stories 3: Twisted Reflection lies in its dynamic battle system, a blend of turn-based strategy and real-time action. Combat encounters are initiated when you engage a monster or are ambushed. Each turn, you and your Monstie have a set of actions to choose from: Attack, Skill, Item, or Defend. The Rock-Paper-Scissors mechanic is central: Power attacks beat Speed attacks, Speed attacks beat Technical attacks, and Technical attacks beat Power attacks. Successfully predicting and countering your opponent's attack type is fundamental to dealing damage and avoiding incoming hits. For instance, if a Great Jaggi telegraphs a Power attack, you should select a Technical attack to gain an advantage. Missing a counter or being hit by an attack that beats yours will result in taking full damage and potentially staggering your Rider or Monstie.
Beyond the basic attack triangle, Monsties possess unique skills and elemental affinities that can turn the tide of battle. Learning your Monstie's strengths, such as a Zinogre's Thunder element, allows you to exploit enemy weaknesses. For example, a Zinogre's Thunder attacks are highly effective against water-elemental monsters. The Headbreak mechanic is another critical aspect. By targeting specific monster parts with powerful attacks, you can break them, often leading to increased drop rates for rare materials like Azure Rathalos Scales and potentially staggering the monster, opening them up for critical hits. Rider skills, activated through the Skill menu, offer a range of support and offensive options, from healing to applying debuffs. Managing your resources, like Mega Potions and your Monstie's special attack gauge, is crucial for prolonged fights. Don't underestimate the importance of the "Guard" action; it significantly reduces incoming damage and can even reflect certain projectiles back at the attacker, a tactic particularly useful against ranged monsters like the Barioth.