The Celestial Keys

When the High Fire expedition first came across the city that now bears the same name as its discoverers, the city was protected by a magical barrier preventing entry to all. At an altar in the middle of a small lake northeast of the city, one scouting party discovered a set of instructions left by those who erected the barrier in the event their kin wished to return to the city. These instructions spoke of three discs that had to be inserted into slots in the altar: the Celestial Keys.
The disc of the Moon was discovered on an expedition to the Windy Mountainside off the southern coast, requiring the group to find a way up the perilous paths leading up to a cavern inside the mountain where the disc was found on an old corpse.
Unfortunately, the disc of the Solar Light did not come as easily. The Herald had taken notice of the expedition’s acquisition of the first key, and ambushed the party at a graveyard north of the city, raising Dolls to fight for him in what would eventually go down in history as the Battle of Gravehill. Upon successfully defeating the Herald and his forces, a second disc was discovered embedded in the grave of Maximus Decimus.
The final key was found in the bowels of the earth under the Temple on the Horizon, requiring the party to activate a mechanism in order to reveal the passage leading to the resting place of the disc of the North Star.
With all three discs assembled, the leaders of the High Fire expedition called a meeting to decide the future of their people. Under pressure of the Herald’s aggression towards the expedition, it was decided that the safe harbor offered by the thick walls of the city was worth the risk of lowering the barrier despite a complete lack of knowledge on why it was erected in the first place. And so, the campsite in the hills was abandoned, the barrier was brought down by inserting all three discs, and the exodus to the newly-christened City of High Fire began.