Chapter 3 delves deeper into the political machinations and introduces several key characters to your party. The battles become even more complex, often featuring unique objectives or powerful enemy commanders. By now, you should have a well-developed party with several advanced jobs unlocked.
Consider unlocking jobs like Geomancer, Dragoon, and Summoner for their unique utility and damage. Equipping 'Auto-Potion' or 'Counter' as reaction abilities can significantly increase your party's survivability. Pay close attention to the story, as it sets the stage for the game's climax.