Guide Terra’s party through Narshe’s mines, following the light.
Walkthrough
Terra’s group must enter Narshe through the mines because the normal gate is blocked. In the security section, watch the light travel across the floor and follow the same path when it is your turn. A mistake triggers a battle and another attempt.
Once the scenarios are complete, equip the reunited characters before the defense. Assign three groups with enough healing and damage to work independently. Moving a group intercepts a soldier; a party that loses can leave a gap in the line.
Defeat the commanders as they approach while keeping the route to Banon covered. Kefka is the last threat in the defense. After the scene with the esper, speak with the party and set out to find 
Terra.
Checkpoint
The mine security sequence asks you to copy a moving light’s route. For the defense, distribute healing across the three teams and cover the approaches to Banon. Intercept the soldiers before they reach him; a strong group on the wrong side of the field cannot protect him instantly.