 Tartarus is the game's main dungeon, which can be visited during the evening, provided the conditions allow it (e.g. the absence of some characters may prevent the player from visiting Tartarus that night). The player may order the other party members to split up to explore the area, or automatically attack Shadows on sight. Players will eventually come across boss floors, in which the player must defeat powerful Shadows in order to continue their progress. Additionally, certain floors halt further progress through the tower until the story progresses. Occasionally, innocent civilians will wander into Tartarus, winding up on certain floors. Rescuing these civilians safely before a full moon appears grants bonus rewards obtained from the police station. Spending too much time in Tartarus may cause characters to become "Tired" or "Sick", which can affect their performance during battle. Additionally, if the protagonist becomes Tired or Sick, some activities, such as studying at night, may be hampered. Players can recover their status by taking certain items, visiting the infirmary, or going to bed early.
