Various writings on how to prepare when the demons attack are engraved on the epitaph. Read the epitaph.
|Zone||Royal Mausoleum 2F|
|NPC||Guardian Stone Statue|
The Guardian Stone Statue told you that the magic to suppress the Guardians was distorted due to demons' schemes. To fix this, get the Blazing Magic Sources that are inside the Guardians.
|Collect||Blazing Magic Source||× 8|