The Lantern King in "Final Fantasy 7: Rebirth" is a boss in a hidden mission in the game. If you want the Lantern King to appear, you must first finish the attack report and unlock all life points. Trigger the hidden siege report to the Lantern Monster King.
How to rebirth in Final Fantasy 7 to make the Lantern Monster King appear
After the attack report is finished, the life point will be unlocked. After the life point is finished, it will tell you the location of the hidden monster (the Lantern Monster King), and it will be marked in the map. Without scanning the life point, go directly Cannot trigger.
Some tasks will only be activated if the exploration points on the map reach a certain level.