Chapter 3 takes you deeper into the Grasslands, leading you towards the Mythril Mine. This area is characterized by its swampy terrain and unique environmental hazards. You'll encounter new enemy types that require different strategies. The main objective involves navigating the marsh and eventually confronting a significant boss. Ensure your party is well-equipped and your Materia is optimized for elemental resistances, as poison and water-based attacks are common here.
