Mortamor is the final boss of Dragon Quest VI, and he has multiple forms, each more challenging than the last. You'll need your strongest party, ideally with characters having mastered advanced jobs like Hero, Sage, Gladiator, and Paladin. Ensure all your Legendary Equipment is equipped. Mortamor's first form uses powerful physical attacks and disruptive spells. His second form often involves multiple targets (his hands) that can cast various spells and status effects. Prioritize taking out his hands first to reduce the incoming damage and debuffs. His final form is the most dangerous, with devastating area-of-effect attacks and high damage. Focus on consistent damage, powerful healing, and debuffing Mortamor's stats while buffing your own. Spells like Multiheal, Omniheal, Kazing, and powerful offensive spells like Kafrizz, Kacrack, and Kazap will be essential. This is a battle of attrition, so manage your MP carefully and use your strongest abilities.
