Head to The Map Chamber and complete the cutscene and conversation
Talk to Professor Fig in the Classroom
To start The Map Chamber, talk to Professor Fig. Fast travel to Professor Fig's Classroom in the Astronomy Tower and proceed straight to the back of the classroom.
Complete the Cutscene and Conversation in The Map Chamber
After talking to the professor, descend the spiral staircase and make your way to the Map Chamber. Complete the cutscene and conversation in the Map Chamber to finish the main quest.
How to get to The Map Chamber
Fast travel available from the Secret Room
To get to the Map Chamber, select the Secret Room from the world map and you will be able to fast travel. The Map Chamber is unlocked after completing the main quest, The Map Chamber, and it is recommended to remember how to get there as you will need to visit it multiple times.