danger lurking in the dark

Exploration Stage: Sun Pavilion
From: Bao
Description: Someone may have tried to put a powerful curse on the sun by sending a light-destroying darkness. I would like to use a spellbook to confirm this, but they are very rare and have not been seen in this city for a long time. Can you manage to find it?
Completed: You have found the spell book. This paper contains immeasurable magical power. Magicians have spent years mastering the art of making such amulets. With this spellbook, you may be able to ascertain whether the sun has been cursed or not.